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GMT ± Perpetual
The Perpetual Calendar can be adjusted forward and backward over a single crown. H/M/s/D/DD/M/Y, 2nd time zone on main dial with patented quickset. Permanent home time on 3rd hand. Big date in a double window.
| Ref. Nr. | 320-60/60 |
| Diameter | 42 mm |
| Case | 18 ct white gold |
| Dial | silverized dial |
| Movement | UN-32 |
| Power-reserve | Approx. 45 hours |
| Winding | Self-winding |
| Water-resistant | 30 meters |
| Crystal | Sapphire crystals |
| Strap | Leather strap |
| Buckle type | Folding clasp |
