I think I can pretty much guarantee that factories even back in the dark days 50 years ago used roll stamps. (How many WWII - 60 year old - guns have you seen with hand stamped markings?)
Those markings are gibberish, apparently from a batch of individual hand stamps, some of them apparently broken. It was common practice in Darra and other centers of primitive gun making to mark the guns with something that looked like factory markings. Since both the gun maker and his customers were illiterate in any language, any thing would do.