Here is an attractive Omega Seamaster Automatic Calendar watch. This automatic calendar watch is the third generation of the "Seamaster Calendar" model, and is one made for the US market. The 17 jewels movement is an Omega caliber 502 with a swan neck regulator. It has been fully serviced and running accurately. The movement serial number is 15392531, dating this watch to 1956. Gorgeous factory finish original dial in immaculate condition. Original signed crown. Crystal is brand new—brand new 18mm matching high-quality genuine leather strap. The 14k gold filled original case measures 35.2mm, excluding the crown by 42.4mm lug tip to lug tip. Case model KX 6275. The calendar feature is working accurately. The wrist size in the photo is 6 inches. To learn how special this watch is, click here: https://youtu.be/gq_ZM2OMsLQ