I don't know the correct design,and have a golden one, so fare

 

The correct one is going to be VERY hard to find I suspect. I don’t recall having seen one for sale..

https://omegaforums.net/threads/help-needed-with-old-seamaster.113208/#post-1499779

 

https://omegaforums.net/threads/ome...ommon-case-reference.4421/page-4#post-2016487

I’m not 100% sure it’s the same, it looks just a tiny bit slimmer, but maybe @iamvr would be interested in a trade. Let me know if you need measurements, I have a spare RG example I could check for dimensions.

 

Unfortunately if the crown fits caliber 500X it does not fit for caliber 420 !?

 

Boley list the crown as ST45004.

Gleave have one.

https://gleave.london/crown-steel-omega-st45004/

 

Hmm, I think thoose are the replacement crowns?

 

Damn, different tap size? Must’ve forgotten about that, I thought they were interchangeable.

 

I think I may have one from a stash of NOS parts I bought, but there is no part number on the sachet. Would you mind posting dimensions and I'll check if mine corresponds.

 

https://omegaforums.net/threads/crown-for-2639.44987/

Any ss tap 12 crown would be interesting

 

Ok, @tamura, I may have the correct crown. A quick measure with my metal non-digital callipers last night (not pressing firmly so as not to mark the crown) gave me a diameter of 5.6mm and thickness of 2.7mm) so within the margin of error. I have a bunch of Omega stems so I'll find one that fits and then measure to determine the tap.

 

I think tap 12 is too big.

Ofrei shows it as a tap 7.



The tap 12 crown is for a 2639 caliber 265.

 

Although Cousins UK list the crown for ref 2759 as 45003ST (original Omega specs).
Gets a bit confusing doesn't it.

 

The 06945004ST is also a tap 12 and close enough to not matter.

 

The tap 12/ tap 7 discrepancy is easy to explain. Tap 7 equals 1.2mm for Jules Borel/Esslinger etc. Cousins has an alternative way of expressing this. When they say tap 12 they mean 1.2mm. Cousins is easier for the layman, but it is perhaps not consistent with other parts of the industry.

 

1.2mm cal. 410/420 winding stem

 

Found, thanks to all involved
tamura
Still one available - old logo!
https://www.ebay.com/itm/134144216781Purchases made through these links may earn this site a commission from the eBay Partner Network