To the extent your photos show and assuming that everything not shown is matching, original, and the stock is unsanded, maybe $1,400 give or take a couple hundred. It's a common code but it is a little less common than most dot 1944's as it was made at the start of production for that year when they were still using the four digit numbering with single letter suffix. That was kind of a minor variation. They aren't particularly hard to find or anything like that, just less so than the very common dot 1944 double letter suffix rifles and later dot 1944 five digit numbered rifles.
Numbers, markings, and wood edges. A little sanding can turn a $1,400 rifle into a $950 rifle. The stock and hand guard would have been numbered internally. Look at the internal appearance of the stock. The interior should be unstained. Look at the bolt cutout. The lines should be sharp. The rear sight and its slider would have been numbered to the rifle. At this point you have not posted photos of the bolt handle's numbered top flat. The firing pin and cocking piece were originally numbered on this rifle. Here's an example of a similar rifle listed in the picture reference you can use for comparison:
A very good deal not very often you buy bring-back K98k rifles for $300!
Tell folks all the time it pays too be patience and this shows it. Still alot of good deals out there folks you just have too find them or by chance they will come too you.
That is one hell of a good score!! I agree, go buy a lottery ticket. I thought I did well at $900 for a 1939 dated Luft rifle but this surely beats it!!!
Again great score. As far as cleaning I would recommend just wiping the stock with a damp cloth or chamois. On my 1940 I just wipe down exterior metal surface with a Rem Oil cloth. Think ya got a hell of a deal!