There are plenty of Eureka instruction manuals for sale on eBay.
From what I remember, Eureka 1400 series uprights made their debut in the mid 1970’s. The 2000 series started being sold in the late 1960s. At some point, Eureka added the 1900 series of uprights, but I often can not tell the difference between a 1400 vac and a 1900 vac. They both are basic budget Eureka uprights with Dial-a-Nap height adjusters, Style F&G dustbags, and foot operated power switches on the motor hood. KMart often sold special edition 1400/1900 Eurekas, but they were coloured differently and were given model numbers in the 600 range.
