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Yes, that explains everything. The seller probably assumed that I would interpret the title 'Mk2 .455 webley' as 'S&W Mk2 .455 webley' and never gave a darn about being a bit more elaborate.
Actually, as an American he probably has no clue that 'Mk2 .455 Webley' in fact means something entirely different to those of us still within the "British Empire" ...