Ann Arbor, MI
Avoid Alex Cooper Auctioneers. I bought a brooch at an online auction that was described as "Signed Tiffany and Co". When it arrived, it was clear that it was actually stamped "TIFFANY & CC" -- a completely different thing!
Alex Cooper Auctioneers refused to refund my money and got quite nasty about it. Either they either were selling counterfeit goods or they were seriously misrepresenting the items at auction. Either way -- STAY AWAY. Not nice people.