Your rifle appears to have gone through a rework sometime during the war. The barrel collar is marked "0,2" indicating it is the second barrel on the rifle and this marking is very typical of rifles that had their barrels replaced. It is odd as it is a 1940 rifle and the spare barrel was made in 1939, but the barrel may just may have sat around in inventory for a while. It is neat that they put the letter block on the barrel, you will notice the "a" on the barrel and "a" on the receiver are a different font. Rework facilities rarely did this--they just usually put the number from the receiver on the barrel.
Reworks are very difficult to authenticate and it is easy to make and pass off a fake rework. The reason is there is not a lot of consistency in how rifles were reworked during the war. Some larger facilities did high quality work and used mostly new armorer spare parts and put new numbers on them. Some low-level facilities, closer to the action did crude work, working with whatever parts they had and overstamping or lining out numbers and applying new ones. It is easy for someone to fake a rifle and just say "it is a legitimate rework".
Your rifle has a barrel replaced showing a high-level of attention to detail based on the added "a", but the other parts are crudely stamped over or just mismatched. As someone else noted, the recoil lug is reversed. It is a laminated stock with a hardwood handguard, which is a bit unusual, as others have noted. Look over the stock very carefully--especially in the grip area and on the bottom edge between the grip and buttplate. There may be markings on the right side or on the metal ring in the stock. If you see markings, post pictures.
In terms of price, a lot of people have spent more on lesser rifles. You just need to know that reworks are a lot more difficult to sell than factory original rifles. I recommend you search over the areas I mentioned on the stock and add pictures of any markings you find along with pictures of any other parts/markings not already pictured. Finally, take a picture of the cut out on the right side of the stock where the bolt seats when it is closed.
