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)