I’m not sure about this at all, but check and see if this description of the Greek M1903 Mannlicher-Schoenauer rifle (from “Bolt Action Rifles” by Frank de Hass) matches what you’ve got:
“The 1903 and 1903/14 Greek M-S rifles are serial numbered. The complete serial number is usually stamped on the receiver ring, on the bold guide rib, and on the breech end of the barrel . . . The place and date (year) of manufacture are usually stamped on the left receiver wall, as for example; STEYR 1914 . . . The model designation of the rifle is usually stamped on the receiver ring, as for example; Y:1903/14. A crown over a cross within a shield is also usually found stamped on the receiver ring.”
It's also possible that you have a sporterized version, with some of the original markings getting ground off and polished before they had it reblued
The Greek M-S was originally chambered for the 6.5 M-S cartridge (aka 6.5x54, or 6.5x53 M-S). Be hard to imagine somebody rechambering/rebarreling it for .308, but I suppose it’s possible. Best let a gunsmith verify before shooting!!!!
“The 1903 and 1903/14 Greek M-S rifles are serial numbered. The complete serial number is usually stamped on the receiver ring, on the bold guide rib, and on the breech end of the barrel . . . The place and date (year) of manufacture are usually stamped on the left receiver wall, as for example; STEYR 1914 . . . The model designation of the rifle is usually stamped on the receiver ring, as for example; Y:1903/14. A crown over a cross within a shield is also usually found stamped on the receiver ring.”
It's also possible that you have a sporterized version, with some of the original markings getting ground off and polished before they had it reblued
The Greek M-S was originally chambered for the 6.5 M-S cartridge (aka 6.5x54, or 6.5x53 M-S). Be hard to imagine somebody rechambering/rebarreling it for .308, but I suppose it’s possible. Best let a gunsmith verify before shooting!!!!