I'll have to dig into my deep-storage safe to verify and to take photos, but my bound book has SKSs with these two numbers. I'm pretty sure that both have the Jianshe arsenal stamp, and I know they are both still in full cosmoline.
263945
231049
[Edit: Just checked my inventory photos and they were clear enough to see the Jianshe Arsenal cartouches on both of these. Do I win a prize? I'm pretty sure that these are all matching, or at least mostly matching. I'll have to dig them out. These were part of the first batch that came out of Albania.]
Bad ass!