Here is an attractive Omega Automatic Calendar watch. This automatic calendar watch is the first generation of the "Calendar" model, where the calendar disc is at 6 o'clock. The 17 jewels movement is an Omega calibre 355 with a swan neck regulator. It has been fully serviced and running accurately. The movement serial number is 13170903, dating this watch to 1952. Attractive original dial in well-aged condition. Original signed crown. Crystal is original and in great shape. It comes with a new 19mm matching high-quality genuine leather strap. The solid 18k gold original case measures 31.3mm, excluding the crown by 40.6mm lug tip to lug tip—case model 3953-SC. The calendar feature is working accurately. The wrist size in the photo is 6 inches. This is considered a large-size square-shaped vintage watch. It is a rare model and rarely will one surface in all original untouched condition.