In reply to:

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After the charging lion sequence, it was identifiable as a sidelock, but appeared to be the conventional pattern rather than the characteristic dipped-edge Lancaster trademark.

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I reckon the rifle in the Lion Charge scene.......



.......is a Rigby sidelock....true dipped edge lockplates!

Unlike the lockplates on a Charles Lancaster, which are usually described as "Leg o' Mutton"....





....as shown on this rifle from Lancaster's 1924 catalogue.

BTW....Welcome to The Fourseventy Club!