No direct answer to your question, but a track ..
F. Spurny has been gunmaker in Vienna,so the script
on your rifle will probably read "F.Spurny in Wien".
He has been "Jos. Heinige Nachfahren", means successor.
I believe to remember there was a highgrade Heinige
on the market in London a couple of years ago,
there is a Spurny in 24-bore(?) shotgun in Vienna,
Springer sold in its 16. auction lot 124 a Spurny rifle...
It has probably Viennese proofmarks, access to proofhouse
records no longer possible..
Cheers
Felix Neuberger
