That sure looks like a single comb in the photo to me. (You close up eye can tell best. Early rose combs look like little horse shoes with the luck running down the beak, indent in the middle).
That doesn't mean it *isn't* a Wyandotte, as many commercial quality Wyandottes have single combs (though culled from serious breeders)....but I'd lay odds you've got a nice Gold Laced Barnvelder there.
Eggs will tell the difference. If a reasonable Barnevelder line, you'll get terra cotta colored eggs (breeder quality will be fairly dark). Wyanottes are more middle tan....though lines vary.