You have a well-used Bulgarian (the "10" in circles is the arsenal stamp) bayonet. Technically, we'd refer to it as a Bulgarian Type II bayonet. There's a few variations of that particular bayonet. Here's some:
I've noticed there's at least four variations of the Bulgarian Type II bayonet. There's also the bayonets that have electro-penciled numbers and those that have deep stamped numbers.
Hope these photos can help someone. As the bayonet is affixed on the rifle, there's the:
* large circle/number on right handle with brown leather
* small circle/number (upside down) on right handle with brown leather
* small circle/number on left handle with brown leather
(possibly a large circle/number (upside down) on left handle with brown leather
* black painted handle/scabbard with black leather
Front:
Back:
Right side:
Left side:
Various markings:
Bayonet collecting is extremely interesting, but costly nowadays. Especially with some of the extremely rare or uncommon ones that can command hundreds of dollars or even a thousand. It's also a bit cut-throat anymore as there's a lot more folks doing it these days. And there's SO MANY bayonets out there - you simply just can't collect one or two!
Check this site out - it was created by one of our members and is a great reference:
http://www.ak47bayonets.com/