21 cm Mörser 16
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The 21 cm Mörser 16, or 21 cm Lange Mörser M 16/L14.5, was a heavy howitzer used by Germany in World War I and World War II. Wikipedia
Barrel length: 2.67 m (8 ft 9 in) L/14.5
Caliber: 211 mm (8.3 in)
Carriage: Box trail
Produced: 1916–1918
Rate of fire: 1–2 rpm
Recoil: Hydro-pneumatic
Shell: separate-loading, cased charge