So, if I were to find one from a dealer that was $280, should I be suspicious?

Would it be kosher to post that photo here to see if it is real? Or should I try to figure it out on my own, which may be difficult since I know so little.

I hate to be a bother to all of you who are so well-versed in thse things, but I really want a dagger as part of the collection that my Dad donated -- and which I wish he had given to me.

Thanks, all!