| Model | 43999 |
| Nickname | Grand Seiko Self Dater |
| Movement | 430 (5722) |
| Type | Mechanical Manual |
| Case material | Stainless steel |
| Notes | Dial variations: SD, AD |
Introduced in 1963, it was the first Grand Seiko with a date complication, equipped with Seiko’s proprietary fast-forward mechanism. The watch guaranteed a water resistance of 50 meters (5 atm).
Caliber 5722A, initially called 430, runs at 18,000 bph, while the later 5722B version runs at 19,800 bph.
There are two variants of the first version, with caliber 430: one with SD dial (Special Dial), and another with AD dial (Applied Dial). The difference is that the indexes in the SD dial are in white gold.
