10-Inch Student Slide Rule
Frederick Post model 1446D [1944]
Frederick Post model 1446 [1945?]
Roos model SR-104

Printed on painted softwood.
Top Edge:  0-25 cm (vertical)
Bottom Edge: 0-10 inches (vertical)
Back: USBS Circular 47 and a table of decimal equivalents. 
On Roos-made rules the red ink fades easily 


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

This model appeared as 1446D in the 1944 Price List and as model 1444 in the 1945(?) Price List.  Specimens with both markings are common.