Here's a rarer one, all matching, combat warhorse. The knurled push button knobs for the rear sight are un-numbered on the bottom, I'll assume a manufacturing error. Most don't know they were serial #'d.
That's a tad pricey, like most of their wares. It's possible the rod's not matching. You could do better. pm me, I might be able to fix you up with a good one for far less...
imho, the armorer made an error on the original unit disk side (with acceptance mark) by omitting the "periods", & simply flipped it & correctly marked it. Nothing sinister here, just move along, lol
Congrats on the pickup, that's the nicest pre-war K98a I've seen. If you don't have any luck on your sling search, contact me, I've got a couple of spare slings & lids.