No5---
P-14 sights are longer than M17 sights and should have a serial number stamped across the back of the top cross-bar.
Going by the proportions of the pictured sight, it would seem to be for an M17---the graduations for .30-'06 are closer together, because the round shoots slightly flatter than .303 and your sight matches a take-off I have laying around.
-----krinko