While digging through the pile today, cleaning and fussing, I discovered that I, too, have one with a stock marked "MK-2". The rifle is in very nice condition, decent bore, wood in good condition. Receiver marks "Mod.98" on the front of the top of receiver, "SWP 45" on the rear of top.
My tag reads: Waffen Werke, Bystrica Brünn, ser.no 88882 a. Black butt cap stamped "43". Non matching bolt etc. Machined trigger guard. Several "dirty birds on the receiver.I can see an "E" stamped on the barrel.My research indicated that it was a late war build and refurbished in East Germany. **Not gospel** Just what I have in my notes.
Edit: If one googles SWP 45, there are some very interesting posts and "theories" about these rifles.
The rifles with the MkII stamps, I've owned were all FTRed K98 types. All of them had matching numbers on bolt/receiver.
Other than that, nothing matched, stocks were new manufacture, Walnut, with butt cups painted black and black painted, stamped, winter trigger guards.
I had a couple of crates of these rifles. Picked them up from International several decades back.
They had all been FTRed to new condition.
I may have been lucky, but back then, I bought a lot of rifles from those folks and they may have sent me some of their best. That happened quite regularly, especially when ordering a half dozen crates.
I sold the last one 5+ years ago.
I've had a few SWP45 rifles in the past, they were all complete but "crude" with only the critical areas nicely machined and finished.
Stocks were roughly finished, metal parts were stamped and at least one of them never had a bayonet lug, right from the factory.
The stocks could be solid beech, walnut or laminated, depending on what they had on hand at time of manufacture.
The receivers had tooling marks all over them.
I shot a few and they shot well enough but in comparison to their earlier built counterparts they left a lot to be desired.
As for rumors, there was one going around that the heat treating wasn't accurate and they were soft or hard, depending on who you spoke to.
PO Ackley did tests on a couple of dozen SWP45 receivers, randomly selected from new in crate surplus rifles and deemed them to be very strong and and the critical areas were well within all tolerances.