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Seiko 66-9990 - Identifying/Sourcing parts and crystal

Jacacanta

By Jacacanta
in Watch Repairs Help & Advice

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Jacacanta Member

Jacacanta

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Posted

Hello Forum,

I started this project of servicing a Seiko 66-9990 (my first "real" project).

I would like to replace the crystal and started looking for information but am struggling to find any specifically for this model (maybe too old ?)

My questions:

- Is there a way to find the correct Seiko reference part number for the crystal for this model ?

- Is there a way to get a "tech sheet" with all Seiko part numbers for this movement (66 A) in case I need to order any replacement parts ?

Many thanks in advance for any help and/or advice 

Best

Joao

Jacacanta Member

Jacacanta

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  On 4/23/2020 at 10:41 AM, FLwatchguy73 said:

this has the part number you're looking for.

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Thank you watchguy! 

One question though: I came across some ebay listings with that part number for the specific case but how to be sure that the ref is the right one ? You can't allways trust the listings/sellers ... ;)

Thanks again for your help! 

FLwatchguy73 Super WRT Addict

FLwatchguy73

Posted
Posted (edited)

Further investigation revealed that the Crystal I initially suggested may not be correct. Boley in Germany has all cases and crystals listed for nearly every model and brand of watch. Please see the screenshot and link below. I would trust the accuracy of Boley's information over anyone on eBay.

https://boley.de/en/case-parts/seiko/20719.6600-9990?q=9990&p=0&s=50&l=18

1761520118_Screenshot_20200423-092703_SamsungInternet.thumb.jpg.b6885c3e76467c948875c1b9293f78b1.jpg

That said, Jules Borel in the states lists the original part number I posted. Jules Borel is also very reputable. Looks as if the original part number is easier to come by though.

http://cgi.julesborel.com/cgi-bin/matcgi2?ref=W]bcWFdcTH

Edited by FLwatchguy73
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aac58 WRT Addict

aac58

Posted
Posted (edited)
  On 4/23/2020 at 1:31 PM, FLwatchguy73 said:

Further investigation revealed that the Crystal I initially suggested may not be correct...

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I think that both references (318N02AN00 and 318N01AN) refers to the same type of crystal, a 31,8 mm non water-resistant with no accesory (like tension ring etc) acrylic crystal. The 01/02 in the middle of the code is just a serial number for production classification, and the 00 at the end, not specified in the first code, means a transparent crystal.

Cousins have this crystal out of stock, but they say it's expected by 2 June

https://www.cousinsuk.com/search?searchTerm=318N02AN00

Edited by aac58
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