Ignoramus21192 wrote:

Anyone knows what gun is this bayonet for?

http://igor.chudov.com/tmp/Bayonet/

Also, there is some sort of etching on the rear of the handle, covered
by rust. Is there some way to clean off rust without destroying
etching?

Austro=Hungarian Mannlicher Carbine,
Bajonett M95, NCO's Pattern for Stutzen M95.

Tom