7548-700B 1978 - Seiko & Citizen Watch Forum Japanese Watch Reviews, Discussion & Trading
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Old 07-21-2019, 04:28 PM   #1 (permalink)
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Default 7548-700B 1978

I picked this up today and will commence its overhaul and service.

I think, though stand correct by others, 1978 is close to the first years of manufacture.

The listing stated 'needs new battery'. When I questioned the seller he said he had only had it for one day and had no tooling to open the case. So I had to take a gamble (gut feeling) looking at the dial, hands and case. The dial had the common place lume blacking which as well all know = moisure at some point. So my first port of call, after removing the case back, was to fit a new battery. Hurrraahhh it runs. The hands turn via the crown and the day/date changes as it should.

Just a quick couple of points, the battery washer was missing, but it turned up in the bottom of the US machine. How or where it had lodged inside the case I know not because I inspected the case after removing the movement and before placing it into the US machine. Happy days. I also noted the click ball was in the hole prior to running the machine but when I had completed the cleaning process, the ball had gone (spring still in hole). I carefully drained the US tank but alas no ball. So I had a scout around the bench and hey presto, there it was, a 1mm black dirty ball against black plastic bench cover so I was lucky with that as well.

So onward.

As I picked it up

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The strip down.

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Last edited by DonJ53; 07-21-2019 at 04:32 PM.
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Old 07-21-2019, 05:03 PM   #2 (permalink)
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Don, you are not throwing away the old mans spandy bracelt then? With your luck finding the minute parts (I never have such luck) the restoration should turn out fine, the dial looks great.
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Old 07-21-2019, 05:05 PM   #3 (permalink)
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Very nice dial. Always good when the circuit and coil are ok.
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Old 07-21-2019, 06:10 PM   #4 (permalink)
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Quote:
Originally Posted by pollyc View Post
Don, you are not throwing away the old mans spandy bracelt then? With your luck finding the minute parts (I never have such luck) the restoration should turn out fine, the dial looks great.
I now have 3 or 4 of them and they are all too large. Probably sell them as a job lot eventually.

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Very nice dial. Always good when the circuit and coil are ok.
Yes, and it's a major bonus to have the correct 5 jewel circuit block.

The case tube is OK but I am going to change the crown because the thread is worn at the leading tooth only providing about 1 1/2 turns. I have spare crowns which provide 3 turns.
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Old 07-21-2019, 09:02 PM   #5 (permalink)
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Originally Posted by DonJ53 View Post
I now have 3 or 4 of them and they are all too large. Probably sell them as a job lot eventually.



Yes, and it's a major bonus to have the correct 5 jewel circuit block.

The case tube is OK but I am going to change the crown because the thread is worn at the leading tooth only providing about 1 1/2 turns. I have spare crowns which provide 3 turns.
You can buy new case tubes on ebay for the 7549 and 6309 divers. They are an excellent reproduction. You just have to drill out the old tube and glue in the new tube. I have done at least 3 of these now and they have all turned out great.
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Old 07-22-2019, 03:14 AM   #6 (permalink)
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You can buy new case tubes on ebay for the 7549 and 6309 divers. They are an excellent reproduction. You just have to drill out the old tube and glue in the new tube. I have done at least 3 of these now and they have all turned out great.



He did write that the case tube is OK


As a side note; I bought some of those tubes/crowns from India. A customer of mine has had success with them and they look good to me.
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Old 07-22-2019, 03:44 AM   #7 (permalink)
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He did write that the case tube is OK


As a side note; I bought some of those tubes/crowns from India. A customer of mine has had success with them and they look good to me.
Yes he did

While the thread crest has some wear the tube is still good.
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Old 07-23-2019, 01:36 PM   #8 (permalink)
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Default Case Assembly

Just managed to get the case together before and after doing my daughters pre MOT vehicle checks. Changed the front discs and pads, 2 number plate bulbs and unblock one screen washer jet...I digress.

Onward,

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Last edited by DonJ53; 07-23-2019 at 01:39 PM.
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Old 07-23-2019, 01:38 PM   #9 (permalink)
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Default Cont...

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Old 07-23-2019, 02:07 PM   #10 (permalink)
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Coming along nicely Don. Top work. On a side note, we have our annual inspections including emissions over here in the US. From what I have seen, those MOT inspections in the UK are a real pain in the ars.
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Old 07-23-2019, 03:16 PM   #11 (permalink)
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Quote:
Originally Posted by Vette Enthusiast View Post
Coming along nicely Don. Top work. On a side note, we have our annual inspections including emissions over here in the US. From what I have seen, those MOT inspections in the UK are a real pain in the ars.
Yes, hopefully the movement will proceed without issues.

I no longer use MOT test stations which are run in conjunction with a vehicle repair garage. I take all our cars the a dedicated test house. They have no allegiance to any garage and don't recommend any workshops should a failure occur. Some can be a pain but must work to set guidelines and according to the spec sheet they check 200 items...in 40 minutes which includes the paperwork. I had my daughters car for 4 hours and checked around 10 items.
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Old 07-23-2019, 03:47 PM   #12 (permalink)
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another great save Don .... looking forward to seeing end result ...
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Old 07-23-2019, 06:10 PM   #13 (permalink)
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Quote:
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Coming along nicely Don. Top work. On a side note, we have our annual inspections including emissions over here in the US. From what I have seen, those MOT inspections in the UK are a real pain in the ars.





USA tests - it seems like in some states anything can be road legal see restodan in Texas on Youtube etc.
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Old 07-24-2019, 04:01 AM   #14 (permalink)
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Back on topic,

One immediate issue, the seconds hand parted company with its bushing and will sort that later.

Otherwise all good and only a small amount of gunk.

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Old 07-24-2019, 06:00 PM   #15 (permalink)
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Don,

Did you get the 7548 glass?
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Old 07-25-2019, 01:12 AM   #16 (permalink)
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Hi Bry, yes thanks PM sent.

I have installed the elusive SK glass in this 7548.
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Old 07-25-2019, 07:30 AM   #17 (permalink)
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Looks like a lovely job so far, I really enjoy these restoration threads so keep the pics coming please!


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Old 07-25-2019, 12:57 PM   #18 (permalink)
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Assembled in 35C

75 for the watch, 9 crown, 3 seals, 1.50 battery, 6 for hands, 2 spring bars, FOC SK glass.

Amended to include a few more pics,

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Old 07-25-2019, 03:03 PM   #19 (permalink)
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Looks fab
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Old 07-25-2019, 04:54 PM   #20 (permalink)
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Fantastic turn around Don! Thank you for linking this thread. Wear it well!
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Old 07-25-2019, 05:20 PM   #21 (permalink)
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It’s been running now for 6+ hours and still spot on the second. Just got to sort a strap...but it’s about 8th in line to receive one.

To be honest I do these overhauls for therapy and satisfaction more than wear.

I am please that this was an honest 7548 from 78 with no issues other than the crown thread. To find one whose correctly labelled circuit block works is the bonus.

Last edited by DonJ53; 07-25-2019 at 05:50 PM.
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Old 07-25-2019, 08:55 PM   #22 (permalink)
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Amazing work! I am no watch technician so I appreciate posts like these showing the entire process: from finding the unmolested timepiece, steps of restoration to the final product.
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Old 07-25-2019, 11:34 PM   #23 (permalink)
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Great work. That is such a lovely piece. Enough character to show it's history.
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Old 07-26-2019, 12:09 AM   #24 (permalink)
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Very nice result Don.
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Old 07-26-2019, 09:37 AM   #25 (permalink)
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Nice result. Would like to see you try and clean those hands and relume to match the dial, or a slightly off white tone, but as is looks very good.
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