I don't think that the "N" series pressed steel mounts were made for 1" diameter scopes, just 3/4" and 7/8". The only N-mount that I have in service is a 7/8", used to attach a Lyman Alaskan to a Savage 1920.
FWIW, I have some old Shooter's Bibles that have the "Type N Mounts" listed.
On page 375 of the 1963 edition, #54, the N1, N2, and N5 are listed as low and the N3, N4, and N5 are listed as high.
