Frederick Post models 1464-70  [1925-1930]
 
 Models 1464, 1465 and 1466 appeared in the 1925, 1927 and 1930 Post Catalogs. 

Retail prices (without leather case) from September 1927 Price List:
1464: $10.20
1465: $11.40
1466: $25.20
1468: Blank
1470: On request
(add $1.05 for leather case)

A picture of the only known  model 1465 [1925-30] is here. 

Ed Chamberlain has the only known specimen of Ritow model 1466 [1925-30].

My guess is that models 1468 and 1470 were never actually available.  They were not listed in the 1930 Post catalog.

No specimens of Ritow models 1464, 1468 or 1470 [1925-30] are known.

 

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.