|The September 1927 Price List gives the following retail
Models 1460 and 1462 were not listed in the January 1930 catalog. Model 1463 was listed in the 1930 catalog but omitted from the April 1930 Price List.
No specimen of any of these rules is known.
This identical page appeared in the 1925 and 1927 Frederick Post Catalogs.
|For more information on Herman Ritow and Post "Ritow" slide rules,
These slide rules were made by Hoch, Huxhold & Hanneman in Hamburg.
Rules identifed as "adjustable" use the DRGM 192052 friction adjusting mechanism.