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"The only Hartmann gunsmith that I found in Lausanne is a Josias, he was by the defense department allowed to work on military guns from 1923 on.

And right you were. I received an email that the gunsmith's engraved name on the receiver is indeed "J.Hartmann" :-). He also was the Swiss Olympic bronze medallist in Paris 1924, smallbore 50 metres prone. He won several world champion titles in 1925, 1927 and 1929.
In 1974, a gunshop under his name still operated (23, rue de Berne, city not indicated).

Addition no. 1 from the website of the Raetisches Museum:
"Josias Hartmann aus Says, Schützenweltmeister, 1893-1982"

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rue de Berne 23 is in Geneva, the other city where he was located, it's a Turkish carpet store now.
There was actually another Josias Hartmann's and that other was from Bern city and estimated to be in business between 1890 and 1936, the last developed a patented (9. October 1927) match pistol.

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And then this.

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rifle made by (or for) the dealer Josiah Hartmann (1893-1982) in Lausanne

J. Hartmann was a gunsmith who has been approved by the Military Department to work on regulatory rifles from 1923

I think he knew the shot ==> Oympic bronze medal in the 50 meter rifle in Paris in 1924 and world champion in 1925, 1927 and 1929

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