FWIW, I have owned 3 swp45's, 2 RC's and one that was maybe original. All the originals I have personally seen had the suffix on the bolt. My personal view is that the bolt is off a dot43 or dot44 and has been renumbered at some point, probably in Czechoslovakiaicon in the late 40's, and probably for an East Germanicon contract - my $.02 worth.

The stock layout, nubering style, etc. all fits for a late 40's refurb going to EG. Later EG rifles had electro-pencilled S/N on the safety, but earlier ones look just like this.