Four-inch Mannheim w Vertical Top Edge
Frederick Post model 1447A  [1932]
1447A appeared only in the April 1932 Price List.  No specimens marked "1447A" are known.

I speculate that model 1447A was a Hemmi model 35 (which appears in the the 1936 Catalog as Post model 1437).
Hemmi 35 was identical to Hemmi 30 (Post 1447 in 1932 Price List and 1440 in 1936 Catalog)  but with a vertical, not slanted, top edge.
No specimen known
Page 13 from April 1932 price list.
Probably became Post model 1437 in 1936.