Ben I hope you were the winner of the photo. It is an original photo which was printed on or near the date on the back. The attached paper caption (slug) looks period and stamping is legit. It looks to be a type 1 photo.
If you read Historicimages or Lexibell as the seller on eBay, you can be assured that you are buying an original photo from an honest dealer. If they would sell a non-type 1 photo, they would identify it as such in their description. No worries with them.
