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Suggest an authentication??? It looks real to me. Seller was from Hungary
Agreed with KGB - post a closer, clearer picture or, ideally, a scan. With a good scan, people here can give you a good idea if it's been reperfed, regummed, or otherwise altered. Assuming it's not a blatant forgery and appears to be fault free, a certificate would enhance its resale value somewhat.
That being said, if you just plan on keeping the stamp in your own collection and you're reasonably confident it's the real thing, there wouldn't be any real need to get a cert. If you want to sell it, you'll get more for it with a cert, but I can't speak to how much more as I'm personally not that familiar with the market for certified US stamps.
It does appear to be hinged which is
usually an indicator that it hasn't been regummed. If someone is going to go through the trouble of regumming, they're probably going to try and pass it off as NH. That, and they wouldn't have put it in a packet of common stamps and sold it for a fraction of its value.
Maybe the Hungarian seller knew little to nothing about US stamps, but that begs the question of how they ended up with a $3 Columbian. And of course, without the Columbian in there, any knowledgeable US collector would have chortled at the $25 asking price and moved along, so who knows. It is puzzling, but nice find all the same.