Here's a bit more late(r) Steyr weirdness. This one is a single rune bnz. 4. It has a completely unnumbered bolt. The catch is that the bolt is unmistakably late Steyr and also has an e/623 on the bottom flat. The only numbered part on the bolt is the safety. There is what appears to either be a partially struck rune, or more likely a "1" on the bolt flat and I'm guessing this is some sort of inspection marking signifying that the bolt was okayed at the factory. I'm betting that the rifle failed inspection due to some bolt related issue and that an unnumbered spare was slipped in to get it out the door. It appears to have not been firing proofed. The back end (bolt sleeve/firing pin/etc.) of the bolt is as would be expected on a single rune rifle (i.e. unnumbered with the exception of the safety). If you're skeptical about an unnumbered bolt, ask yourself when was the last time you saw a late Steyr unnumbered bolt (loose in the wild).