Looks like Cyrillic markings due to the "15 ШТ." which is commonly used in military markings and stands for "15 units" or "15 ea." If so then Russian, Yugo, or other eastern block origin.
Hard to read some of the letters due to the particular stencil style and my seriously lacking Cyrillic reading skills, but I see:
First Photo: 56-А-231 15 ШТ.
2821/923
Second Photo: УНИ?-2
<> N?(Shouldn't be an N if Cyrillic but clearly different than the И above, may be an M?)1363