Kamilaroi:
It is indeed a M-1924, however my limited research would indicate that the 10.75x68 chambering was not listed in any Steyr catalogues prior to 1934.

You have definitely met this rifle before: should have bought it, mate!

Johann:
Thanks for your words of encouragement, my friend. ...and the marvellous photos of your fine examples. I have been hopelessly addicted to Mannlichers since acquiring a lovely 1903 6.5 carbine many years ago. I've been looking out for a good M1910 ever since, but this latest acquisition is the first one offered with a bore in the condition I like! The fact that it is in such fine condition overall, a takedown, and with British proofs is just icing on the cake!!

And since we're assembling something of a gallery here, permit me to include a reminder of the little 6.5 carbine in my gainful employ: