It was indeed called the Tru-Line Jr. press. It was introduced by Lyman in 1948 and its design was improved in several respects in 1957. And indeed the Tru-Line die sets are fairly pricy on the well known internet website. The same size dies are used on the Lyman 310 tong tool. I do not know if my TLJ press is pre- or post-1957, will have to check. Still no plan to use that press. BTW, there is an adapter to allow use of the TLJ dies in now-standard 7/8”x14 threaded presses. I have one of them.