Frederick Post model 1444
Post 1444 from 1925-30.  Photo courtesy Fred Astren who owns the only specimen I am aware of.   This identical page appears in the 1925, 1927 and 1930 Frederick Post catalogs.
These rules were made by Koch, Huxhold & Hannemann.
Rules described as "adjustable" use the DRGM 192052 friction adjusting mechanism.