its an austrian gunmaker build Mannlicher M 95 rifle made between 1919 and maybe 1960. I am not sure about the 7x57 and think if the caliber is right the 7x57R is more likely.

I have an own thread for M 95 sporter and will safe the pics there
http://forums.nitroexpress.com/showflat.php?Cat=0&Number=151815&an=0&page=0#Post151815