Yes and no.
The Daly Lefever sidecockers were made in Europe by Lindner and are stamped with the Lefever patent.
Much later Lefever made either I or DS grade guns for Daly which were labeled with the Daly group (3 initials beginning with S). The same is true with the Ohio version of DM Lefever crossbolts in one of the lower grades, the O Excelsior if my memory serves me right. Sorry I can't be more specific, my files are boxed up for my move to North Carolina and out of the Hawaii gun hell.

Great-Great Grandson of D.M. Lefever
www.lefevercollectors.com