The bridge itself is wrong. It's definitely a replacement. It looks like a Badass, which is pretty common to see on older Gibsons but they definitely weren't making them in '53. Most of the '52s had a trapeze tailpiece that a lot of people hated and swapped out for a one piece stop tail like the ones they used up until '55. I've also seen a few that didn't have neck binding. The early models had a lot of inconsistencies. I wouldn't be so quick to call this one a fake yet. I'm not sure the rest of the guitar is original. The aging on the binding and fret markers looks good, but the lack of oxidation on the pickup poles is suspect. Also, it possibly was refinished at some point. The seller definitely seems a little sketchy.