It is loaded with polish Glyphs as Paul noted. The top flat looks ground - notice lack of cam shoulder on bolt handle base ( because it's been ground down to remove serial ).
I've had a couple of these polish Karbinek98 bolts and they were all serialed identically to the german fashion except lacking any Alpha prefixes.
So basically it looks to be a bolt salvaged from one of those spanish civil war peices - that is if the 'scrubbing appears legitimately old' , otherwise it's a humper job , but most importantly it's not an armorers bolt for nothing. I have yet to see or hear of an armorer kar98a bolt but having had handfulls of gew98 armorer bolts it would likely follow their pattern(s) and it does not first off of course by being polish.