Comparison
Citizen Promaster Air vs Grand Seiko SBGR321G
Sourced specs side by side. A value is highlighted only where one is objectively greater (power reserve); size and the rest are a matter of taste. unknown means no sourced value yet.
At a glance
- Both use an automatic movement.
- Both cases measure 40 mm across.
- Citizen Promaster Air has a titanium case; Grand Seiko SBGR321G is in stainless steel.
| Spec | Promaster Air | SBGR321G |
|---|---|---|
| Brand | Citizen | Grand Seiko |
| Family | Promaster | Heritage |
| Reference | Promaster Air | SBGR321G |
| Production start | unknown | unknown |
| Production end | unknown | unknown |
| Status | Current | unknown |
| Retail price | unknown | unknown |
| Case material | Titanium | Stainless steel |
| Diameter | 40 mm | 40 mm |
| Movement | Automatic | Automatic |
| Caliber | unknown | Seiko 9S6 |
| Winding | unknown | Manual |
| Power reserve | unknown | 72 hours |
| Jewels | unknown | unknown |
| Frequency | unknown | unknown |
| Complications | unknown | unknown |