Whenever there's both a vinyl and a styrene version of a release, I'd prefer to have the vinyl. But sometimes sellers (especially on eBay) don't say which they have. Even on discogs where there's quite a bit of info on different pressings, many of them aren't correctly listed as styrene. (I'd just ask the seller, but sometimes they don't know how to tell or they don't respond.) If I'm lucky I can tell from photos whether the label is glued on. But otherwise, without having the record in my hands, are there ways to know which material it's made of? One thought I had was that maybe certain pressing plants only used one material or the other in certain years. Can anyone tell me whether that's true? Are there any other factors along those lines that I could rely on?