I agree with Jani and without the Cerro-Safe on hand, wax is very easy. With the 8.7mm mark, it would be a post-1910 longarm and Heinrich Scherping was long since retired, or possibly expired, by the time of your example. Also if a 9.3X72R, it wasn't standarized until circa WWI(1913???), so I'd venture a guess at the time frame of 1910-WWI. Also as a guess, I'd say Heinrich Scherping didn't finish it but sourced the Suhl craftsmen and had his name rolled stamped on it. But the typical Rigby style forend latch always puzzles me on the Scherpings. Does it have a lever operated forend latch?
Kind Regards,
Raimey
rse
