Kalashnikov Bayonets of the World

i have a 58 with no markings except for a diamond by the serial and what looks to be a "C" on the front where the "11" arsenal marking would be the serial number is "A 21936"

I also notice "K2" or "Y3?" on magazines as well as this electro pencil marking

Thank you for the response you make a good point About the collecting part.

What is the best advice you guys can give me as far as collecting . I have quite a few and by the looks of it i have a ways to go . But if you had to do it over again what would you say to yourself say a year or two into this . I enjoy looking at some of your guys collections they are amazing. :Tx:

Amazing collection .