@CertusNon-original barrel and a custom project? I’m doubtful that’s an original Winchester produced 10.75
Correct . It was rebarrelled with a Pac Noir custom barrel . However , Winchester Western’s 1947 catalog has an advertisement where the 10.75x68 mm Mauser , 7x64 mm Mauser , 8x64 mm Mauser and 9.3x64 mm Brenekke are listed as available offerings . I will try to get ahold of the advertisement and post it over here . I am confident , however that the rifle shown by @deewayne2003 is an original factory offering . It shows all of the little signs .