Unknown 1954 Omega 18k Rose Gold w/ Synchrobeat Seconds Hand

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Part I :

I. Introduction :
It's an Omega watch from around 1954, in solid 18k rose gold, with original blued steel Synchrobeat-style seconds hand which seems quite rare. It measures 33.5mm in diameter without the crown, it has nice faceted lugs and a caliber 420 movement.

The case back has the french-style Omega logo engraved and “JP” for Jules Person a French case maker, on its inside.

The bracelet buckle is also solid 18k rose gold and engraved with the Omega logo on its outside. Typical of french buckle from 1940 to 1960 at least.


II. For now, only 3 known models:

1) Mine :

- Serials :
Caliber serial number n°14079230.
Case serial number n°11220194.

- Photos :


- 2nd shooting :


2) NOS watchmaker Paris - CharlyHorloger ( https://www.horloger-charly-paris.fr/ / https://www.instagram.com/charlyhorloger/ you can find pictures of this model on its instagram ) :
Photos :



3) Not-NOS from the same watchmaker Paris - CharlyHorloger (same) :
No further informations. He told me this by messages.


III. The seconds hand :
It looks identical to the seconds hand of Synchrobeat watches. I think that it is the only blued steel hand with an arrowhead for Omega watches of that era.

Focus on the blued steel hand of my mysterious watch :


Photos of Synchrobeat and documentation :


Text inside : "The 720 pieces that had already been exported were rapidly taken off the market and returned to Bienne where the cases were melted down and the parts reused".

Text at the botom : “ This item is offered by Hess Fine Auctions item and business located in the USA item is in Florida”.


Others photographies from the internet :


Comparaison of mine vs internet :


Comparaison of Charly's vs Synchrobeat advertising





Part two comming
 
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IV. Vintage Omega Archive research for caliber 420 :

6 models, 2 models are Seamaster “beaffy-lugs”.

For the 4 others models :

None with the same lugs as mine, but some dials look the same either in original black-and-white Omega vintage pictures, either on the internet :


OT 2650 : 1952, the only one referenced in 18k solid gold (“OT”)

Omega vintage picture dial doesn't look the same

Dials of the internet that look like the mysterious watch : I did not find


OJ 2690 : 1954, 14k solid gold

Omega vintage picture dial looks like.

Dials of the internet that look like the mysterious watch :

Redial ? https://www.liveauctioneers.com/pri...ng-watch-1950s-cal-420-2690-1-exlnt-serviced/
But honeycomb dial : https://www.chrono24.co.uk/omega/2690--id44961735.htm
But honeycomb dial : https://vintage-portfolio.com/shop/omega/vintage-omega-handwinding-33mm-honeycomb-explorer-dial/


CK 2735 : 1954-1958, 35 mm, stainless steel

Omega vintage picture dial looks like, except the two-tone characteristic.

Dials of the internet that look like the mysterious watch : I did not find


CK 2667 : 1952, stainless steel, screw in case back

Omega vintage picture dial doesn't look the same

Dials of the internet that look like the mystery watch :


https://marketplace.watchcharts.com...7-3sc-cal-420-17j-manual-mens#google_vignette
https://antique-watchlife.com/36113.html


I also asked Omega Headquarters, but they don't know which model it is. Can't wait to have extract of archive reopened !


If you have any informations, please come back to me !