Hemmi model 36.
Appears in 1936 Catalog and Price Lists through 1940.
 

Top Edge: Blank Bottom Edge: Blank  Back: 0-15 cm and 0-5 inch scales. Paper Table Back of slide: [S, L, T]	This page is from the 1936 (18th Edition) Post Catalog
	Similar to Post model 1437 except with CI scale and scales are 2.5 cm longer.