Hi John,
Is it similar to this?
This is a TST-80 according to this article--round string guide, V-shape neck, steel tremelo block, and--what do you know--laquer (nitro) finish (says so in top paragraph)! Do your pickups have little orangy-yellow rubber "pickup cushions" instead of springs between the pickup screws and the pickup under the scratchplate?--I'm pretty sure the top paragraph says this model has those too, as some Springys with E pickups do. If they're not there I'm not sure it proves anything really as these do deteriorate over time and crumble, and could have been replaced with standard springs.
This page doesn't say anything about pickup model, but I've never seen or heard of a Goldstar with E pickups. Elsewhere in this article, there is reference to E pickups being for Springy models (and I am assuming by this NOT for Goldstars). Is there a stamp that says "A" or "B" on the plastic under the scratchplate? If there is and it says "B" chances are your scratchplate is a transplant. However, again, I'm not sure if Goldstars have these quality indicators on their scratchplates. On Springys I'm pretty sure the "A" stamp was put on ST-60s and up.
One way or another, with a V-neck and nitro finish this is almost certainly a TST-80. I'm a big fan of the "U" stamp pickups--I find them a little mellower sounding than the "E" stamped ones. Any photos? How is it to play?
Chris