Dave, welcome to the forum!
Just a WAG, but guns like this came to the US in the 1920's and 1930's through Pacific Arms, they had barrel sizes made to order and also they called them "interchangeable" barrels...
Ed
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Edward Tinker
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Co-Author of Police Lugers - Co-Author of Simson Lugers
Author of Veteran Bring Backs Vol I, Vol II, Vol III and Vol IV
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