hoby1 - After reading your responses, my advice is only accept a bank wire in this situation. It's essentially cash in hand, same day, without the worry of a buyer filing a complaint for who knows what weeks/months down the line.
If the buyer has an issue with a bank wire, vet out their concerns. Make sure you hold up your end of the bargain by providing as many pictures and videos of the pin. I would also suggest offering up a phone call to answer any questions they may have. This will create assurance you aren't misrepresenting your pin (not that you are).
Good luck with your sale.