I thought Silver Biecentennial Halves were S Mint mark only...

[MalteseFalcon]

I found this Philadelphia Mint mark Silver half for sale on ebay:

http://cgi.ebay.com/1776-1976-BICEN...ryZ41103QQrdZ1QQcmdZViewItem#ebayphotohosting

 

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[Blackjack77]

I think the "S" was proof only. P & D were circulation strikes.

 

[goldinmypan]

My guess is that someone electroplated it to look like silver. According to the Red Book, all 1976 bi-cent halves that were silver were made in San Francisco mint. "S" mint mark. The San Fran mint also made the Proofs.

 

[MalteseFalcon]

Ahh...yeah that's what I thought. Guy musta silver plated it.

Thanks!