Seiko 7C43-6A00
The Seiko 7C43-6A00 Professional 200M mid-sized Titanium model from the late 80’s.
History
Not much from me, I recently placed a bid and came out the highest bidder sometime in January 2012. Purchased from an Ebay seller from China, it arrived in 1 week (to Los Angeles, CA, USA). I wanted to add a few things to my collection, namely a Titanium case, a mid-size watch, a Professional Diver. So in a way, this watch saved me money by getting three watches in 1 package.
Personal Impression- Overall, I really like this watch, it’s not too big on my skinny wrist. The bezel styling is similar to the 600M Titanium. I like the gold dial, its interesting that I had a mod mock up that looks like this watch. The only thing that I would change if I work in the design department would be to make the hands colored black- like the second hand, although maybe the gold colored hands were intentional(?). The case is dull blasted look finish, which I like. To close, I like this watch so much that I would probably not buy another divers watch- yeah right.
Case Measurements
Diameter = 39,5 mm (8 o/c to 2 o/c)
Lug to lug = 46,1 mm
Weight = 48 grams (no band)
Thickness = 13 mm
Lug width = 19 mm
Comparative pictures with 6309
7C43 vs 6309.
Case Breakdown
Here is the watch as received. Crystal is pretty scratched and the bezel is seized. Case in very good shape. The pictures were taken during initial disassembly. My guess is that this watch has never been serviced.
Rotating ring popped off the case.
The crystal retaining ring removed, using a table top caseback remover.
Noticed there is a plastic spacer and a 1 piece bezel click spring. Note the plastic ring has a shoulder on one side, this part goes up when installed.
Movement removal.
Removing the caseback exposes the back anti-magnetic shield and a slight rust on the wavy ring movement spring.
Note the screwdriver points to the notch where the stem lines up.
Here the movement before removal from the case.
To remove the crown, first unscrew then press gently down on the dimpled lever as shown, then pull the crown out.
The titanium crown. The gasket is very squashed.
Movement breakdown
(Notice the little metal showing behind the dial on the top of the Day/Date window, I thought the dial feet was broken but ended up the anti-mag shield has been misaligned.)
Hands removed.
The dial and the antimagnetic shield behind it, removed. I am glad to say that there were no serious damage to the dial, other than a few spots on the weak lume.
The day wheel c-clip removed, note this one does not have a bevel on one side, it does have a groove on its outside perimeter.
Remove the 6 armed star first (between the center and ‘16’ ,‘17’ on the date wheel), note its orientation, the manual explains this.
The plate removed. Now everything can be removed. Note do not remove the wheeled cannon pinion; it comes out the other side.
Here is the plastic mainplate from the dial side. This picture was taken when it was completely disassembled( otherwise the cannon pinion would still be visible in the center.) Note there are 3 jewels here and 4 on the train plate.
Train side.
The movement shield and the spring for the second hand wheel pinion has been removed. This exposes the circuit board.
The circuit board is removed.
Note the rate adjustment has not been messed with.
Next is to remove the coil and the battery positive side contact.
The train bridge is removed.
Note that the setting mechanism is traditionally located on the other side, but for a quartz, this setup isn’t too strange. This picture show a partially removed lever which is the second hand hacking arm.
Here is the very small and powerful magnetic rotor. To clean this part, I rolled it thru a Rodico (Blue) and it came out nice.
This is the cannon pinion wheel. The big wheel with the triangular like arm is not solidly attached to the pinion, but has a good friction fit. These two parts slips when the hands are adjusted.
Further dis-assembly of the setting mechanism. Notice that the metal levers are pivoting on metal posts. This gives me a good feeling that this is not just a regular quartz movement.
Movement Specs.
Analog quartz 7 jewel with day and date. Battery type 1,5 volt SR927SW.
Movement is load compensating, which is useful for these reasons:
1. Battery conservation – it will use the lowest battery current possible to drive the train.
2. Increased driving pulse for higher load( due to gummy train lubrication or even just during the calendar change).
Anti-magnetic properties.
It has a movement cover plate in the back and a magnetic shield behind the dial. Good for 200G( not much considering I have seen 4800G rating on Citizen dress watches-but I’m not complaining ). The anti-magnetic protection works by the ‘shield’ allowing the outside magnetic flux to be absorbed and channeled away from the center cavity that has the circuit and coil.
Bezel
Anti-reversed 60 minute clicks. Bezel o-ring width 0,60mm( as measured). Though I don’t have a lot of diver watches that has bezel clicks, I have to say that this has the most solid positive feel to it.
Crystal
Screwdown crystal retaining ring with L gasket.
Slight domed, flat bottom glass (Hardlex?) crystal 28mm OD x 2,5mm thick. It has a bevel on the outside top surface where the retaining ring sits.
Crown
Titanium screw down crown. Titanium case tube. Stem gasket type (if replacement is not available, I try to use 2,6mm OD x 1,4mm ID. Maybe if there is room, I would use 2 stacked.)
Overall, the Titanium case is absolutely rust free. The movement is solid and is working very well. It is too far early to tell but initial check puts the movement to 4-6 sec per month.
I would like to thank Chris and the other nice people of Jules Borel and the nice lady from Ferrell for tracking parts for me.
I would also would like to give a special Thank You to our own Noah R. for his input in this review and for his help throughout this forum
Regards,
Rob T aka ‘5seikos’
The Seiko 7C43-6A00 Professional 200M mid-sized Titanium model from the late 80’s.
History
Not much from me, I recently placed a bid and came out the highest bidder sometime in January 2012. Purchased from an Ebay seller from China, it arrived in 1 week (to Los Angeles, CA, USA). I wanted to add a few things to my collection, namely a Titanium case, a mid-size watch, a Professional Diver. So in a way, this watch saved me money by getting three watches in 1 package.
Personal Impression- Overall, I really like this watch, it’s not too big on my skinny wrist. The bezel styling is similar to the 600M Titanium. I like the gold dial, its interesting that I had a mod mock up that looks like this watch. The only thing that I would change if I work in the design department would be to make the hands colored black- like the second hand, although maybe the gold colored hands were intentional(?). The case is dull blasted look finish, which I like. To close, I like this watch so much that I would probably not buy another divers watch- yeah right.
Case Measurements
Diameter = 39,5 mm (8 o/c to 2 o/c)
Lug to lug = 46,1 mm
Weight = 48 grams (no band)
Thickness = 13 mm
Lug width = 19 mm
Comparative pictures with 6309
7C43 vs 6309.
Case Breakdown
Here is the watch as received. Crystal is pretty scratched and the bezel is seized. Case in very good shape. The pictures were taken during initial disassembly. My guess is that this watch has never been serviced.
Rotating ring popped off the case.
The crystal retaining ring removed, using a table top caseback remover.
Noticed there is a plastic spacer and a 1 piece bezel click spring. Note the plastic ring has a shoulder on one side, this part goes up when installed.
Movement removal.
Removing the caseback exposes the back anti-magnetic shield and a slight rust on the wavy ring movement spring.
Note the screwdriver points to the notch where the stem lines up.
Here the movement before removal from the case.
To remove the crown, first unscrew then press gently down on the dimpled lever as shown, then pull the crown out.
The titanium crown. The gasket is very squashed.
Movement breakdown
(Notice the little metal showing behind the dial on the top of the Day/Date window, I thought the dial feet was broken but ended up the anti-mag shield has been misaligned.)
Hands removed.
The dial and the antimagnetic shield behind it, removed. I am glad to say that there were no serious damage to the dial, other than a few spots on the weak lume.
The day wheel c-clip removed, note this one does not have a bevel on one side, it does have a groove on its outside perimeter.
Remove the 6 armed star first (between the center and ‘16’ ,‘17’ on the date wheel), note its orientation, the manual explains this.
The plate removed. Now everything can be removed. Note do not remove the wheeled cannon pinion; it comes out the other side.
Here is the plastic mainplate from the dial side. This picture was taken when it was completely disassembled( otherwise the cannon pinion would still be visible in the center.) Note there are 3 jewels here and 4 on the train plate.
Train side.
The movement shield and the spring for the second hand wheel pinion has been removed. This exposes the circuit board.
The circuit board is removed.
Note the rate adjustment has not been messed with.
Next is to remove the coil and the battery positive side contact.
The train bridge is removed.
Note that the setting mechanism is traditionally located on the other side, but for a quartz, this setup isn’t too strange. This picture show a partially removed lever which is the second hand hacking arm.
Here is the very small and powerful magnetic rotor. To clean this part, I rolled it thru a Rodico (Blue) and it came out nice.
This is the cannon pinion wheel. The big wheel with the triangular like arm is not solidly attached to the pinion, but has a good friction fit. These two parts slips when the hands are adjusted.
Further dis-assembly of the setting mechanism. Notice that the metal levers are pivoting on metal posts. This gives me a good feeling that this is not just a regular quartz movement.
Movement Specs.
Analog quartz 7 jewel with day and date. Battery type 1,5 volt SR927SW.
Movement is load compensating, which is useful for these reasons:
1. Battery conservation – it will use the lowest battery current possible to drive the train.
2. Increased driving pulse for higher load( due to gummy train lubrication or even just during the calendar change).
Anti-magnetic properties.
It has a movement cover plate in the back and a magnetic shield behind the dial. Good for 200G( not much considering I have seen 4800G rating on Citizen dress watches-but I’m not complaining ). The anti-magnetic protection works by the ‘shield’ allowing the outside magnetic flux to be absorbed and channeled away from the center cavity that has the circuit and coil.
Bezel
Anti-reversed 60 minute clicks. Bezel o-ring width 0,60mm( as measured). Though I don’t have a lot of diver watches that has bezel clicks, I have to say that this has the most solid positive feel to it.
Crystal
Screwdown crystal retaining ring with L gasket.
Slight domed, flat bottom glass (Hardlex?) crystal 28mm OD x 2,5mm thick. It has a bevel on the outside top surface where the retaining ring sits.
Crown
Titanium screw down crown. Titanium case tube. Stem gasket type (if replacement is not available, I try to use 2,6mm OD x 1,4mm ID. Maybe if there is room, I would use 2 stacked.)
Overall, the Titanium case is absolutely rust free. The movement is solid and is working very well. It is too far early to tell but initial check puts the movement to 4-6 sec per month.
I would like to thank Chris and the other nice people of Jules Borel and the nice lady from Ferrell for tracking parts for me.
I would also would like to give a special Thank You to our own Noah R. for his input in this review and for his help throughout this forum
Regards,
Rob T aka ‘5seikos’
I haven't been stringent enough on this point, I need to pipe up on all 6306 threads, too.
