I test mounted the old Anthony lens on the Century and it does barely cover to the edges! Research indicates it technically is a '5x7' lens. Mounted on an 8x10 camera there is a pleasing gradual fall off of light (unlike the abrupt cut-off of a modern lens). I think this means I'll keep the Century for now. This will give me a classic old 8x10 with a brass lens and a spanking new 8x10 with a modern lens to play with.
BTW that Anthony lens is not a "bokeh" lens. It is a corrected, very sharp landscape lens about 250mm focal length.
I thank my brother for the Anthony lens. He found it at a local flea market for a couple bucks.