Trav-Ler produced reel to reel tape recorders from 1961 to 1961 which were manufactured in the United Kingdom. These tape recorders targeted the consumer market. Trav-Ler tape recorders used tube electronics. The company produced 2 track machines with 110-120 voltages for the North American market.
Casian Ltd of 27 Grafton House, Golden Square, London W1 was best known for this model, the Trav-Ler
In late 1960, the rights for manufacture and distribution were bought by Aerialite Ltd in Chesire in December 1960 but the Trav-Ler had all but disappeared in the U.K. by 1962.
So then we see the Trav-Ler TT 591 showing up in the USA with an indication that it was manufactured in Chicago.
Perhaps the mystery will be unraveled by one of our members?