Well, the best I can say is "Yes!"...& then again "No!"....
.... I'll try to explain... They usually left the factory with the highest standard of what I would call "quick quality" meaning doing a repetitive task by hand, to a point, where it appears as, or is indistinguishable from, a machine operation... Almost all, 99.9999% of the cast bottoms of Mauser or Haneal (Sp.??) had the center, front to back , parting line buffed off... I've seen a very, very few that were original, and still had the line or remnants there of??.. And, you can tell because if you look close, the bottom will exhibit a ghost shape of a bowtie across the bottom! and usually it will be smooth. It's pretty hard to remove the numbers and maintain the integrity of the bowtie mentioned.. It actually reverses the wide and narrow facets on the bottom... Now here is where this one does get a little sticky.. and that is the rough surface on the very center of the bottom radius.. It shows bubbles? Lots of them, and this if from buffing / sanding too deep and hitting pockets of gas bubbles created by the addition of the equivalent of a silicone type additives to aid the casting process... Same thing happens when you try to weld up the bottoms, it releases the die casting additives trapped in the metal and you have MORE bubbles.... Probably a bad casting to boot! The marks may also be some type of Impact rash, can't tell from here? But, back the other way, I think there is more of a strong case for the mag being original as the bowtie is present and strong... I think it's good!! But again, that's just me... I'll be quite now...
til...lat'r....GT