Here is a rare and immaculate Omega Seamaster Automatic Calendar watch. This bumper automatic calendar watch is the first generation of the "Seamaster Calendar" model, and it is the first Omega watch movement to carry a calendar disc. The 17 jewels movement is an Omega caliber 353 with a pointer regulator. It has been fully serviced and running accurately. The movement serial number is 12582927, dating this watch to 1952. Factory original dial in superb condition. Original signed crown. Crystal is original—brand new 18mm matching high-quality handmade genuine leather strap. The gold capped over stainless steel original case measures 35.3mm, excluding the crown by 43.2mm lug tip to lug tip. Case model 2627 - 4. The calendar feature is working accurately. This watch is in its original unpolished condition. Let's just say, this is as clean and as great as this watch/model can get! The wrist size in the photo is 6 inches.