I would have to agree that the first pic is a Hump Back.
Pre Rem 11 was made from 1905 to 1910
Rem 11 was made from 1912 to 1948
Savage Mod 720 1930-49
Mod 726 1931-49
Mod 740C 1936-49
Mod 745 1940-49
Browning 1903 to 2000.
This info came from the Blue Book of Gun Value.