Here is a rare 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 13107833, dating this watch to 1952. Waffle-aged original dial in great condition. Original signed crown. Crystal is brand new—brand new 18mm matching high-quality handmade genuine leather strap. The solid stainless steel original case measures 35.2mm, excluding the crown by 43mm lug tip to lug tip. Case model 2627 - 5 SC. The calendar feature is working accurately. This watch is in its original unpolished condition. Great investment timepiece! The wrist size in the photo is 6 inches.