Comparison
Seiko 21407178 vs Seiko SPB421
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 belong to the Seiko Prospex family.
- Both cases are stainless steel.
| Spec | 21407178 | SPB421 |
|---|---|---|
| Brand | Seiko | Seiko |
| Family | Prospex | Prospex |
| Reference | 21407178 | SPB421 |
| Production start | unknown | unknown |
| Production end | unknown | unknown |
| Status | unknown | unknown |
| Retail price | unknown | unknown |
| Case material | Stainless steel | Stainless steel |
| Diameter | unknown | 40.5 mm |
| Movement | Solar | unknown |
| Caliber | unknown | unknown |