Omega Seamaster Ranchero case 1961
The Omega reference PK 2990-1 case was used for both Seamaster and Ranchero models in the 1950's-60's. The 2990-1 case was also somewhat oversized for this vintage, at 36x44mm. ( without winding crown)

Here's a 1961 vintage Omega Seamaster Rose gold plated, 40 microns,( no dents, plating , in excellent condition) caliber 268 with sub-seconds dial. Excellent and hard to find oversized case 36x44mm signed stainless steel snapback case (reference PK 2990-1)

http://www.omegawatches.com/planet-omega/heritage/vintage-watches-database?ref=14428

The dial has gentle patina, ( “macro photography always make tiny flaws, look worse than they are” ) “keeps time perfect perfectly, and is a very good opportunity to own this rare Omega”

Asking 381 USD / 280 € included shipping cost. Pay Pal availabe, lot of good reference on the Forum and Ebay.