Re-numbers like these are VOPO... no consistency to the number type or font size, or the direction from which they were applied. Flat spots on the bottom of the knobs are easy giveaway that the numbers are not original.
If the mag body had 1001/2 stamped on it, it is post war and was produced by East Germany.
The notches in the mag bottom knobs are some previous owner's idea of "customization"... UGLY.

IMO
OTOH---they should be excellent shooter magazines.