| 28 cm A No. 1 gun | |
|---|---|
 Heiligerlee class monitor with 28 cm A No. 1 gun | |
| Type | Naval gun |
| Place of origin | Germany |
| Service history | |
| In service | 1876 - |
| Used by | Netherlands |
| Wars | First World War |
| Production history | |
| Manufacturer | Krupp |
| Specifications | |
| Mass | 27,650 kg (60,960 lb) |
| Length | 6.10 metres (20 ft 0 in) (22 caliber) |
| Caliber | 279 mm (11.0 in) |
| Maximum firing range | 0 m (0 yd) |
The Dutch naval gun 28 cm A No. 1, or 28 cm L/22, was the first of a few 28 cm Breechloader Krupp guns used by the Dutch navy. The 'A' stands for Achterlader, the Dutch word for Breechloader.