Movement: Omega R 13.5 Width without crown: 18mm Lug width: around 15-16mm Thickness: 7mm Lug to lug: 32mm Very rare and early Omega tank manual wind watch from the 1920s. Dial shows patina and signs from nearly 100-years of wear. Leather strap is used and it makes the watch appear and feel a lot bigger on the wrist. Service history is unknown but it works and it is running approximately +- 1 minute per day. This watch will be shipped with tracking.