These mags appear to have a baked on enamel finish.
Reading through this
SA Defense article, it looks like it is Late Bulgarian for the following reasons:
1) It has the Late Bulgarian type as the inward facing rib on the rear top-left side of the mag expands backwards in a slanted concave shape to the feed lip reinforcement plate as described in the article (I think):
The third Bulgarian steel pattern is a unique type. The inward facing rib on the rear top-left side of the mag expands backwards in a slanted concave shape to the feed lip reinforcement plate. On the right side it expands backwards in a slanted convex shape. Early mags appear to have a phosphate finish while the later/majority have a black enamel finish. Most of these “Late Bulgarian Steel Mags” are unmarked, but a few have shown up stamped with either an “E” in double circle or “25” in double circle stamping on the rear spine. The “25” in double circle represents Optico Electron Inc., a well known Bulgarian manufacturer of polymer AK-74 mags. (Author’s note: In the future I will refer only to the number of outward facing ribs on a steel mag. The inward facing rib at the rear will be considered a “given” and covered by its type description.)
View Quote
This is a picture from the article:
Right to left, First European Ribbed Type, Second European Ribbed Type, Late Bulgarian
My magazine:
2) The follower appears to have a Late Bulgarian profile as per this picture at the above link:
'
Late Bulgarian is 4th from the right.
My follower:
Other pictures:
Do you agree this is a Late Bulgarian magazine?