Frederick Post model 1443  [1923-24 Ten-Inch Student]
Same as Nestler 2012
This is page 26 of "Instructions for Calculating Slide Rules"  published by the Frederick Post Co and printed in Germany c1923-24.  "Post's Student's Slide Rule" is model 1443. 


Post Model 1443, Student's Slide Rule

"1443" does not appear on rule itself but black two-piece pasteboard case is marked "Post's Chicago 1443."   Back of the rule has USBS Circular 47 and is marked "Albert Nestler A G Lahr (Baden) Germany."  Markings are printed on painted softwood.