I'm new to this myself, but I can tell you if the crown sits on a fancy K, then it's Norwegian, from the Kongsberg armory. Sounds like it's worth trying to restore, unless you can see obvious signs of the barrel being hacksawed but I couldn't tell you about getting parts. I bought mine at an estate auction wearing a label that said "30/40 craig - 30-06". Soon found out different...seems a 30-06 Krag might be risky to shoot.
Hopefully, some of the more knowledgeable guys will read through and can answer some of my questions at the same time. My barrel was cut to 22 7/8 inches and mounted into a Bishop Monte Carlo style stock and so has relatively little collectors value. Sure looks nice tho..s/n on mine is 135488 and dated 1919 on the receiver. No caliber marks anywhere though. I'm sure someone will tell you there's a better chance of getting a more correct history if you include the full s/n. My numbers on the receiver, barrel, and rear site match, but the bolt and trigger guard have two different numbers. Again, kills the collector value. I have read on other sites that standard 6.5x55 swede cartridges are too hot for this action but on the other hand, I've read here and talked to other local owners who use it regularly. I've put about 40 thru mine so far with no problem but I would like to get more info on handloads just to keep the stress to a minimum. So how about it, other Kragheads??