I would like to know what the stamps mean on my 91/30 mosin nagant?

i have recently purchased a 91/30 mosin nagant. This rifle is rather worn. the date on it is 1942r, but what i would really like to know is what the tiny stamps all over the gun mean? There is a few of them. The Ones on the stock say 33, 1B, and a strange looking A. There is also a few that i can not make out. Can anyone tell me what theese mean?