| Brand | Glashütte Original |
| Caliber Number | GO 39-50 |
| Base Caliber | In-house |
| Movement Type | Automatic |
| Jewels | 48 |
| Power Reserve | 40 hours |
| Vibrations Per Hour | 28,800 |
| Balance Spring | Flat |
| Shock System | Incabloc |
| Regulator | Swan neck |
| Functions | Perpetual calendar |
| Country of Manufacture | Germany |
| Known Models | 39-50-14-22-04 |
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.
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