Iron-on or not?

[lord ched]

About to come into a cache of rare 70's promo shirts- Uriah Heep, Jack Bruce, Southside Johnny and the Asbury Jukes, and obscure prog-rock acts Horslips and Triumvirat. Potentially lucrative- problem is, the print on many of them is rubbery-seemingly, sort of like an iron on. And some of these are iron-ons, but I'm suspecting that some of these are a cheap or primitive screenprint. The ones I'm thinking of have one- or two colour prints and mostly text, with the record company label and a one-colour representation of the album art. Is this wishful thinking on my part? Or can I list these as something other than iron-ons?

The Uriah Heep looks sort of like this one...

http://cgi.ebay.ca/URIAH-HEEP-WONDERWOR ... _500wt_951