25 mm Hotchkiss anti-aircraft gun
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The Hotchkiss 25 mm anti-aircraft gun was an anti-aircraft autocannon designed by the French firm of Hotchkiss. It served in World War II with French, Japanese and other nations' forces. Wikipedia
Barrel length: 1.5 m (4 ft 11 in) L/60
Effective firing range: 6.8 km (4.2 mi) at 45° with HE shell
Maximum firing range: 3 km (9,800 ft) (effective); 5.5 km (18,000 ft) (ceiling)
Shell: 25 x 163 mm; HE:.29 kg (10 oz); AP:.32 kg (11 oz)