Did you look at the buttplate closely, usually these have unit markings. If it is a good one it can make $100's worth of difference.
While the kar.98a is less desirable, have less of a following, than the Gewehr98's, this rifle would be considered to be about as rare as they come; there are many low production Kar.98a, but this one is by far the lowest, nothing close, and it is the first year and only Erfurt made them in 1907. It would be worth thousands in my opinion, if i had thousands, I would pay that for it, assuming everything is as it appears to be. It is probably close to unique, it has the condition (
I think it is factory original, or at least so far as you show, and that is the standard), it has the rarity (
Kar.98a do not get rarer) and I know of no others being sold before. It would be the key, or centerpiece, to a kar.98a collection.
I would say $2000 is rock bottom value, I think most would agree due to its rarity and condition it is worth at least a couple thousand,even without more pictures; it could be worth twice that, or more, and probably is, but you would have to do better pictures or someone would have to see it. A similar rarity in a more popular rifle variation, say a Gewehr98, Kar.98b or Kar.98k would be worth many times this, but the kar.98a doesn't have the allure that the Gewehr98 or kar.98k have, - I doubt there is a finer example that survived, and any 1907 or 1908 is rare (
real rare, not elusive or scarce "rare", which is usually how the word is used describing rifles... this rifle is actually rare.). Only a handful of Erfurt/1908's are known, most are seriously screwed up or in Germany.
Be sure to thoroughly look the buttpalte over, it might have a really valuable unit marking, most early 98a do...
I am trying to arrive at a value that my brothers and I agree is fair market value. One of us will buy the others out. I found a few more marking on the butt plate and took some better pictures of others. Thanks for all the help in identifying the rifle.