Re: Any Idea ... ???
A more likely guess would be the 6.5 Dutch.
The Mannlicher-Schöenauer has a spool magazine, the Dutch Mannlicher does not have this Schöenauer magazine, but rather an en-bloc clip that drops out the bottom as the last round is chambered.
Unlike the Mausers, these rifles and carbines have a split rear receiver bridge and a forward positioned bolt handle.
The gun has a common gene with the Italian, Greek and other Mannlichers.
Cheers from Darkest California,