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I think this is a 17 cm SK L/40, so the case is "just" 1051 mm long. There is the so-called "Haube" on top making it a bit longer. My biggest case is a 28 cm C/95 measuring 1221 mm without Haube. But if you look into literature, several cases even longer exist.
Of non experimental cases I believe the Austrian-Hungarian 35 cm M1916 has the longest case measuring 1460 mm. The longest I know of are German WW2 experiments like the 24 cm anti-aircraft guns Gerat 80 and 85 (measuring a whopping 1842 mm).
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