Your Thoughts On This 1888 Seated Quarter Requested.

I've had this laying in a box labeled as "probably counterfeit" since then (didn't really look silver to me) . Since we have a new "bullion" shop in our small town..and I saved them about $800 this past Saturday, they said they'd check some questionable coins for me on their Sigma. (as it was the only one that tested as not silver was one that I won here on the forum). He seemed to think that it was real (proof) and we negotiated between sending it to PCGS, taking it to a show in January and getting it graded, or buying outright as is. I offered it to him for $250 as is...and he took me up on it. He offered to give me more if it comes back real. I told him not to worry about it...I made money on it.