10-inch Universal Duplex Slide Rule
Frederick Post model 1458 [1936-40]
Hughes Owens model 1765
Hemmi model 150

These pages are from the 1936 (18th Edition) Post Catalog. 

 Note:  The rule illustrated in the catalog and the specimen are both 1-3/16 inch wide.  Hemmi model 150 was widened to 1-5/8 inch about the time of WWII.  There may be some specimens of Post 1458 that are 1-5/8 inch wide.