10-inch "Universal" Slide Rule
Frederick Post model 1452D [1944-45]
Same as Roos SR-1074

Top edge: 0-10 inches (slant)
Bottom edge: 0-25 cm (slant)
Back: USBS Circular 47 plus a table of decimal equivalents

On Roos-made rules the red ink fades easily and the celluloid facing turns very yellow. 


Excerpt from 1945(?) Price List 
Second price is per dozen

Identified as model "1452D" in both 1944 and 1945(?) Price Lists and on specimens.  Specimens marked just "1452" are not known.