Thanks to a TEP Handle inquiry from Alan Abramowitz (http://abramowitzstudio.com) and his photographic proof above, we have our evidence (click to enlarge). What history we have come by seems to suggest that the brothers begin Tiltall as a head-only design, but once attached to its body, both the Marchioni and the iterations that followed - with the Leitz exception above - Unifoto and its brother, Star-D; Omicron and presently, KingHome - all have stayed with a fixed head design. Thank you again, Allan for your photos. If others have discovered some Tiltall variants in their travels, please drop us a jpeg to post.
Another variation of the Leitz Tiltall from Mike Campos - here the head unthreads from the column itself. Not, as above, from a more expected a 1/4-20 threaded bolt. I have not tried to remove my head from the column with my four Leitz by unthreading - I will. From the Uniphot to present, the column was glued into place. Also, as above, Mike's Tiltall head has a separate label on the head - and a metal one at that. All my Leitz Tiltall have only the "body" label - a couple, metal and a couple, paper.