Maybe I’ve just been burned a few too many times, but checking first editions has become this whole ritual for me. The copyright page is obvious – you look for that specific print line, ideally 'First Edition' stated plainly or sometimes just '1' in the number line. But it’s never just that. I always cross-reference with a good bibliography for that specific author or title. Something like 'Points of Issue' for Stephen King collectors is a lifesaver – it'll list the tiny misprints or binding quirks that confirm it. Dust jackets matter too, the price on the flap, even the publisher’s address can be a clue. Honestly, half the battle is knowing the common reproductions. I got fooled once by a beautiful 'The Great Gatsby' that had all the right interior marks but a jacket from a later printing. Now I treat every purchase like a mini investigation. It’s part of the hunt, I guess, even when it’s frustrating.
Online purchases are the worst for this. Photos are never of the right pages, or they’re blurry. I’ve started just messaging sellers with a very specific checklist. If they can’t or won’t answer, I walk away. It’s saved me more money than any 'bargain' ever would have.