This magazine has eight welding spots. On the bottom of the left side of the magazine housing are two hand-stamped markings. The first is a circle that surrounds either the number 19 or 5. Either to the right or left of this circle is a second smaller circle that contains the letters KK stacked on top of the number 10. In almost all cases, the stamps are not properly applied and usually are only partially visible; this is an indication that these stamps were applied manually. Sometimes the letter S is hand-stamped on the bottom of the spine. The meaning of the markings is unknown.