Sorry but can't make out the barrel marking due to glare. Your 1918 receiver only has one Imperial inspection marking, rather than the usual three. This tells me that although made in 1918, it was not assembled as a complete pistol during WW1, rather was kept as a spare part, perhaps by one of the repair depots, and assembled by them post 1933 (judging from the test fire proofing) either as a replacement part or as a whole gun. I'd have to see all the other parts & markings to say which. TH
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