Here is an Omega Seamaster Automatic Calendar watch. This automatic calendar watch is the last generation of the "Seamaster Calendar" model with the design of beefy lugs. The 24 jewels movement is an Omega calibre 562 with a swan neck regulator. It has been fully serviced and running accurately. The movement serial number is 18609645, dating this watch to 1961. Factory original dial is in great condition—original signed crown. Crystal is brand new—brand new 18mm matching high-quality genuine leather strap. The solid stainless steel original case measures 34.6mm, excluding the crown by 42mm lug tip to lug tip. Case model 166.009. The calendar feature is working accurately. The wrist size in the photo is 6 inches.
1961 OMEGA SEAMASTER CALENDAR
Circa: 1961
Model: Seamaster
Caliber: 562
Movement serial #: 18609645
Jewel count: 24 jewels
Movement Type: automatic wind
Case model: 166.009
Case material: Solid stainless steel
Case gasket: O-Ring rubber gasket
Crystal: Acrylic New crystal
Crown: Signed
Case Diameter excluding crown: 34.6mm
Case length lug tip to lug tip: 42mm
Dial: Factory original finish
Hand type: Dauphine (original)
Strap material: genuine leather
Strap width between lugs: 18mm
Wrist size in photo: 6 inches