Here is a stunning vintage Omega Constellation watch dating to 1966 according to its movement serial number 23955229. This case design is known as the round case model with short straight case lugs. This watch has been professionally serviced and is now running accurately. The automatic movement is an Omega caliber 561 with 24 jewels. The factory original pie pan dial is in excellent condition. The case is made of solid stainless steel. Brand new case back gasket. Original signed crystal in excellent condition. Original hidden signed crown making hand winding not possible. For some people it will take time to learn how to pull out the crown due to its hidden design. Case model is 168.004 and measures 35.7mm across excluding the crown by 40mm lug tip to lug tip. Making this case model one of the biggest (diameter wise) Constellation model. Watch will come with its original metal Beads of Rice bracelet which can fit up to a 7.25 inch wrist nicely. Wrist size in photo is 6 inches.