O21
| Drawing Information: | |
|---|---|
| Category: | Real Designs |
| Country: | Netherlands  |
| Type: |
Submarine 
|
| Class: | O21 |
| Ship: | O21 |
| Operator: | Military |
| Date Depicted: | 1940 |
| Date Submitted: | Oct 20, 2018 |
| Last Revised: | Jul 31, 2023 |
| View(s): | Starboard Elevation |
| Author(s): | ALVAMA, |