Lefever made Thumb Push openers through the Side-Cockers & on into the Automatic Hammerless guns. If there was anything there he didn't want his name on it would I believe have been that it was a hammer gun. Seems as if he "Officially" quit building hammer guns & concentrated on Hammerless after he & John Nichols parted ways.
Whom-ever made it, it is one gorgeous gun. I woud certainly like to have one like it & Yes I would have to shoot it a bit.

Miller/TN
I Didn't Say Everything I Said, Yogi Berra