Simplified version of the Versalog.

Custom made by Hemmi for Frederick Post and Hughes-Owens; no Hemmi model number exists for this model.

First appeared in 1967 Hughes-Owens Slide rule Catalog and 1969 Frederick Post School Drafting Supplies catalog but many specimens with earlier date codes exist.  Warren Salomon has a model 1450 Versatrig with an "LI" (september 1961) date code.

1969 Frederick Post School Drafting Supplies Catalog,  Page 26.  Versatrig is described in lower right corner of page.

Post model 1450 Versatrig    Date code "RK"  (November 1967)