For sale or trade is a 1957 2849 reference Omega Seamaster Calendar. The case is in nice condition, unpolished or close to it. The dial has developed a light patina. The 503 caliber movement runs, winds, and sets well, however service history is unknown. Price is $750. Please see below for more details, and feel free to reach out if you have any questions. Dial: Original, non-refinished dial has developed light patina. The dial features a crosshair and no-lume markers and hands (non-radium variants are not easy to find). Case: Original 34.5mm 2849-4 reference case is in very nice, seemingly unpolished condition. The case shows light wear but has no significant scratches or dings. Bevels on the lugs and "Seamaster" and "Waterproof" text on the case back are still clearly visible. Crown: Original signed clover crown. Crystal: Original (I believe) signed crystal with Omega logo etched at center. Has light scratches that should buff out. Movement: Original 503 caliber movement dates to 1957. The movement runs, winds, and sets well, but service history is unknown so a service is recommended prior to regular use. Strap/Bracelet: Comes on the generic 18mm brown leather strap pictured. However, I do have some 5-row BOR bracelets I could part with as well for extra cost if interested. Price is $750. Open to trades for nice non-radium 50s or early 60s Seamasters, Constellations, Geneves, Conquests, and Flagships (see my WTB/WTT here). I'll cover insured US shipping, international shipping is available but cost to be discussed with buyer. Transferwise is preferred for payment. OF seller reviews are here. Returns are accepted if watch is grossly misrepresented. Watch is located in the USA.