6105-8000 Hack question - Seiko & Citizen Watch Forum – Japanese Watch Reviews, Discussion & Trading
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Old 09-21-2012, 06:58 PM   #1 (permalink)
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Default 6105-8000 Hack question

Just bought my first vintage seiko dive watch. 6105-8000 with 6105A movement. Looks authentic but there's a few things that seem off from what I've read:


1. the dial is water150resist instead of proof
2. the movement appears to be able to hack
3. the crystal looks like flat instead of domed


my concern is it's authenticity. Is there someplace or someone I can send it to? I'll try and take some photos when I get the caseback off. TIA.





Dan
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Old 09-21-2012, 07:04 PM   #2 (permalink)
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Default Re: 6105-8000 Hack question

Post some pics of the dial, that would be a good start. Both of my 6105's hack, although they are 8110 & 8119's.
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Old 09-21-2012, 07:11 PM   #3 (permalink)
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Default Re: 6105-8000 Hack question

The 6105a movement could have been modified to add the hacking feature to it at some time, could even have had the auto plate changed at some time, i have added hacking to a few A movements.


The resist dial could be a later addition, or it could be a late model, what date is the watch ? normally though the A movement will be with a proof dial.


So many variables really and what ifs.
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Old 09-21-2012, 07:24 PM   #4 (permalink)
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Default Re: 6105-8000 Hack question

thanks. i bought the watch from a seller on this forum. it just arrived a few hours ago.


the date on the watch is 84, so I'm assuming April 68. i don't really know the mechanics of watch movements, would i be able to identify if the hacking was added somehow?
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Old 09-21-2012, 07:33 PM   #5 (permalink)
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Default Re: 6105-8000 Hack question

I would have thought a 68 model in it's original form would have a proof dial, April 68 is a early one as they were first on the market in March 68.


I would think almost certain that the hacking has been added unless it is a 6105B movement with a 6105A auto plate.
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Old 09-21-2012, 07:36 PM   #6 (permalink)
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Default Re: 6105-8000 Hack question

Quote:
Originally Posted by TheTigerUK
I would have thought a 68 model in it's original form would have a proof dial, April 68 is a early one as they were first on the market in March 68.


I would think almost certain that the hacking has been added unless it is a 6105B movement with a 6105A auto plate.

Sounds like a cobbled together 6105, I hate it when that happens.
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Old 09-21-2012, 07:40 PM   #7 (permalink)
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Default Re: 6105-8000 Hack question

The 6105a and 6105b movements have different baseplates and it is that that precludes the ability to simply make a 6105a hack. There are extra machined cutouts on the 6105b baseplate that provide the clearance internally for the hacking lever to be installed. Therefore, it is not feasible to make a 6105a hack with the original 6105a baseplate, unless you are able to machine it yourself (or their is a third party kit that works around this).


There isn't a cheat available here either with other calibers that are based on teh same foundation. While the 6106 can hack, the baseplate is yet again different in that there are changes incorporated into it for the different quickset mechanism that the 6106 uses.


The watch you have there should absolutely only have a 6105a in it.
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Old 09-21-2012, 07:42 PM   #8 (permalink)
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Default Re: 6105-8000 Hack question

Quote:
Originally Posted by 84Maroon

Sounds like a cobbled together 6105, I hate it when that happens.

IMO nothing wrong with it being "cobbled" together as long as you know that when you are buying it.
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Old 09-21-2012, 07:45 PM   #9 (permalink)
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Default Re: 6105-8000 Hack question

Quote:
Originally Posted by TheTigerUK

IMO nothing wrong with it being "cobbled" together as long as you know that when you are buying it.

By the looks of his OP, I don't think he did.
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Old 09-21-2012, 07:53 PM   #10 (permalink)
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Default Re: 6105-8000 Hack question

Well in the sales listing you can clearly see the dial says water resist and a picture of a 6105a winding bridge. Unfortunately, there is no picture of the 6:00 end of the movement to determine if the hacking lever can be seen through the inspection hole that is there (this would confirm it is a 6105b movement).


If I were guessing, I would say that the dial and movement were taken from a 6105b, and a 6105a winding bridge was installed (as the winding bridges are a universal fit).
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Old 09-21-2012, 07:56 PM   #11 (permalink)
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Default Re: 6105-8000 Hack question

Quote:
Originally Posted by TheTigerUK
i have added hacking to a few A movements.

Did you machine the baseplate John or is their a kit available? Curious how to do this as I was trying to figure out a way a while back when all I had available for an 8119 was an a movement?
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Old 09-21-2012, 08:05 PM   #12 (permalink)
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Default Re: 6105-8000 Hack question


Well they are very small letters..

Quote:
Originally Posted by Technoman

Did you machine the baseplate John or is their a kit available? Curious how to do this as I was trying to figure out a way a while back when all I had available for an 8119 was an a movement?

Since reading your comments i have just gone back on my records to have a look at the two "A" movements i fitted hacking too and only have one picture left (it was Dascos/Davids 8000) and i see it was actually a "B" but it dident have a hacking lever, so forget what i said about putting hacking into the "A", age, memory, plays tricks [size=78%].


[img]
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Old 09-21-2012, 08:10 PM   #13 (permalink)
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Default Re: 6105-8000 Hack question

Oh Lord John, That was some time ago
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Old 09-21-2012, 08:20 PM   #14 (permalink)
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Default Re: 6105-8000 Hack question

Quote:
Originally Posted by TheTigerUK

IMO nothing wrong with it being "cobbled" together as long as you know that when you are buying it.
disclosure, description all in the wording or it should be!!!
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Old 09-21-2012, 08:46 PM   #15 (permalink)
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Default Re: 6105-8000 Hack question

Thanks for all the feedback. I'm ok with a cobbled 6105. At least everything seems original. I can live with it. I like all weathered nicks and worn out look. So I guess if i wanted to restore this watch, i would replace the winding bridge with one marked "6105B", find a 6105-811X case and caseback with the proper crown and drop everything in this watch in it. Thanks again everyone!
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Old 09-21-2012, 09:21 PM   #16 (permalink)
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Default Re: 6105-8000 Hack question

It's a great watch, wear it and enjoy
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Old 09-22-2012, 05:00 AM   #17 (permalink)
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Default Re: 6105-8000 Hack question

Update: It doesn't hack. I guess it was a fluke earlier when I got the second hand to stop. Shopping for a replacement dial and watch band and I'll should be wearing it all the time.
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Old 09-22-2012, 06:58 AM   #18 (permalink)
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Default Re: 6105-8000 Hack question

Dimsum things coulda been a lot worse what strap you gonna put this gem on ?
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Old 09-22-2012, 02:39 PM   #19 (permalink)
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Default Re: 6105-8000 Hack question

Quote:
Originally Posted by Dimsumboy
Update: It doesn't hack. I guess it was a fluke earlier when I got the second hand to stop. Shopping for a replacement dial and watch band and I'll should be wearing it all the time.
Original sales post states original and you are now looking for a dial etc which appears non original to the watch resist from 68! Well as long as your happy.
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Old 09-25-2012, 04:08 AM   #20 (permalink)
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Default Re: 6105-8000 Hack question

Bur, I was thinking either a reproduction wjean waffle strap, or a nato strap. I've read that 20mm natos should fit. I was thinking of strapping on one made from a nice piece of shell cordovan on this bad boy after I try and buff out the crystal or replace it. I'd like to do more research and see photos of it before deciding. Any suggestions on where I would be able to get NOS crystals are appreciated.


Geran, I figured anything this old is probably cobbled to some degree. And i really should've asked before reaching out and letting my impulsiveness get the best of me. I'm just happy that most of it seems original to me.


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Old 10-11-2019, 11:49 PM   #21 (permalink)
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I just received the 6105-8000... 1970 February with Proof/Proof... and it appears 6105B movement as it is hacking. Is this consistent with an original Seiko 6105-8000 or possibly a cobbled together watch? I was expecting it to be the 6105A with non-hacking. Thanks!
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Old 10-12-2019, 01:04 AM   #22 (permalink)
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Quote:
Originally Posted by 604style View Post
I just received the 6105-8000... 1970 February with Proof/Proof... and it appears 6105B movement as it is hacking. Is this consistent with an original Seiko 6105-8000 or possibly a cobbled together watch? I was expecting it to be the 6105A with non-hacking. Thanks!
Your watch is correct.
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