According to Roy Dunlap's book, Gunsmithing, all Winchester made actions have the "big oval hole" or "duck pond" in the receiver bridge, none of the Remington made Enfields do, and some Eddystone made ones do and others do not, above and below a certain serical serial number, which Dunlap was unable to obtain.

Here is one of my remodeled P-14's, a Remington: metal work by Harry Creighton, stock by Hal Hartley, caliber .416/.300 Winchester Magnum, Lyman 2 1/2X All American scope in a Buehler mount.