Although your pics aren't very definitive, the rifle appears to be a 7.62 conversion of a Steyr Model 1912 Mauser Short Rifle (SR) from the original 7mm.
The action was originally made between 1912-1914 (since production ceased at the start of WW I), in the white - and stayed that way after conversion unless altered.
It should have a two-groove barrel.
Most of the SR conversions had turned-down bolt handles - with the long rifle (29" bbl) conversions having the straight handles.
The disc on the right side, with the crossed miner's hammers, is another Chilean proofmark.
The "-61" isn't necessarily the year it was converted, but more likely the year the conversion was first authorized.
The furniture configs can further confirm the model.