Frederick Post model 1464  [1925-1930]
Post 1464 [1925-30]
Photo courtesy Fred Astren.

The 1/31/22 patent (printed in gutter) was issued to Herman Ritow. 

The page shown here is from the 1927 catalog. 
For more information on Herman Ritow and Post "Ritow" slide rules, click here

These slide rules were made by Hoch, Huxhold & Hanneman in Hamburg.

 Rules identifed as "adjustable" use the DRGM 192052 friction adjusting mechanism.