|Caliber Number||GO 39-50|
|Power Reserve||40 hours|
|Vibrations Per Hour||28,800|
|Country of Manufacture||Germany|
This Glashutte Original caliber GO 39-50 was found in a Senator Perpetual Calendar watch with 48 jewels with a 21K gold rotor.
There are other variations of the caliber 39 including 39-22, 39-34, 39-59, 39-47, 39-52, and 39-58.