Any thoughts about the Z? For me it looks odd if bubba tried to renumber the bolt, and at the same time stamped a Z, as for me it does not make any sence.
"Bubba" , like "humped", has become a completely useless term in my opinion. Do you mean an individual in Denmark? Or a low level armorer? or a country lacking the technical, manufacturing, will or want, to neatly and cautiously rework a rifle?
In Europe, someone MAY be able to find a Serif set of font or number stamps. In the US they are RARE, and extremely expensive if you do find a set. They are extremely expensive to make correctly and to match original markings. There is much reference to "humping" and "faking" that is ludicrous given the knowledge and expense required to ACCURATELY replicate. Forgeries abound, but the gross ignorance to manufacturing in the collecting field shows itself, badly, in regards to some of the fakes available. I am a rank NOVICE when it comes to K98's and even I can pick out the rifles that were restamped with the cheaply and incorrectly EDM made stamps from Poland and elsewhere.
Not picking on you, or anyone, merely stating my observations.
Not everything we see is "malicious" or intended as a fake. I knew an older gentleman who has since passed who had a nice little collection of weapons he captured from WWII. Its been at least 15 years, possibly more, so I don't remember the details, but he had ground the numbers off one of his rifles because he did not like that it was non-matching numbers. He also refinished the stock and reblued at least one rifle because he did not like the wear and tear. He did not care about collectors, in fact until I told him otherwise, he did not even know that WWII guns were collectible. He did not collect guns, was not in the "gun community", in fact, I don't think he owned any guns besides those.
I remember being about 17 years old when I bought my first Garand. One of my family members who served in WWII came over and I showed it to him. He was astonished. He figured they had all been scrapped decades prior. He had no idea why anyone would have one, save one, shoot one, never entered his head that after WWII someone would keep such a thing.
Every once in awhile, we have to, as collectors, pull ourselves out of our narrowly focused work, and remember that the rest of the world has no clue what we are doing. My own family, if they found a K98k in the barn would, quite LITERALLY, throw it in the burn pile with the trash. It has no purpose. It has no functionality. At best they would throw it in the scrap bin. I took a pile of machinist files from the barn that were from my wife's great grandfather. Late 1800's, early 1900's, everyone in the family, vocally, expressed that I was nuts. They were going to throw them away or just leave them to rust. Most people around here still think MAUSER is spelled MOUSER. That is how I find a lot of my auction buys. There, now you know the secret