Need Seiko case back O-ring seal

[BillM]

I’m looking for a Seiko case back seal and can’t seem to figure out the right size. 
I measured the o-ring groove in the case @ 29.7mm x 0.7 mm

heres a photo of the case back showing the numbers. 
 

Any idea where I can get this seal?  
Thanks, Bill. 
 

 

[Graziano]

Hi there BillM ,I see you in California have you tried https://seikosis.com/ I have bought many Seiko parts from them . They are in California , or you could try your local watch material house who should have an assortment of caseback seals where you should find one that will fit.

Hope that helps

Edited August 26, 2022 by Graziano

[BillM]

Thank you, I will try the link you posted.  
I have purchased an assortment of watch case back seals and none of them fit. 
 I can’t find a part number that cross references the number on my case back, and no one gives actual sizes, so I don’t know what to order.  

[Birbdad]

3 hours ago, BillM said:

Thank you, I will try the link you posted.  
I have purchased an assortment of watch case back seals and none of them fit. 
 I can’t find a part number that cross references the number on my case back, and no one gives actual sizes, so I don’t know what to order.  

Hey fellow bay area watch noob. 
I ran into the same issue. Do you have calipers? i'd probably buy some as a generic identical gasket costs literally about 1/30th the cost of an OEM one and it's the same damn thing. 

If you don't have calipers i would go get some cuz you'll need them for random things, if you do you just gotta measure the size of the gasket and figure out the esoteric weird way they post sizes for these things at places like esslinger and jules boral and other watch material houses. 

I basically asked this same question and the kind people here gave some good info for this sort of thing in this thread
 

 

[BillM]

I found this info on another watch site; super helpful   
https://www.emmywatch.com/db/case/seiko--6309-5820/

 

[swesty]

Almost a year on and this turns up in a local antique shop, in the UK  Check out the numbers