To Gankai/Rick Hill:
According Gundigest 8x75R has been introduced around 1910,
so this could be original barrel.
Re label:
I can offer you
1. Black/white copy of above repro label on thick paper
2. Colour copy of above repro label in red on thick paper.
If you send me your address via PM I will mail them to you.
Kind regards
Felix Neuberger