These instruments were really aimed at student guitarists, at the least the ES125T and ES140T were available as 3/4 size instruments for people with a smaller reach. The ES-120T, whilst a very well-built guitar, had very simple electronics, allowing it to retail at roughly the same price as an SG Junior. A remarkably low price compared to Gibson's other hollow and semi-hollow offerings.
Although the very first ES-120T shipped in 1961 (and it was only one instrument), this was the first catalog inclusion of the model; it was just a little too late to make the 1962 Gibson catalog.
Suggested prices were: ES125T and ES125T 3/4 $195, ES140T 3/4 $245, ES120T $170. American zone 1 prices, September 1964.