AK 74 Mag ID help? Pic.

I'm trying to ID some AK 74 5.45x39 mags and I'm getting conflicting answer. I have 10 plum 30rd with the triangle and arrow in it like the one pictured on the left. OK they say its Russian and on the other side there are numbers 21,22,25,41,42,44,48 and 51. So what are they and about what are they worth never used in wrapper?



Also most have a M like this one.