Pages are identical in 1925, 1927 and 1930 Post catalogs.
|In gutter: FREDERICK POST CO. CHICAGO GERMANY."
The catalog says models 1448, 1449 and 1450 have "new rimless indicator" but this specimen has a framed indicator and so does the related illustration in the catlog. I have never seen one of these models with a rimless indicator.
This rule was made by Koch, Huxhold & Hannemann..