The German 3.7cm SKC/30 served onboard almost every Kriegsmarine ship in World War 2, including many U-boats. This high velocity, but single shot gun had a low rate of fire of around 30 rounds per minute. It was the only Kriegsmarine anti-aircraft gun larger than 2cm (20mm) early in the war.

This set of photoetched 3.7cm AA guns from Flyhawk has enough parts to make 23 twin mounts, suitable for any of the larger combatants like Tirpitz or Scharnhorst at the time of their loss.

There is a single sheet of instructions included, showing the 9 steps to fold and assemble each mount.