The price is on the high side for a 12ga B. For $650 with a little careful shopping he can pick up a 12ga Sterlingworth shooter.

To get some idea of what is available in the price range, go to Gunbroker http://www.gunbroker.com/Auction/Browse.asp?cat=3104 and sort by price. Keep clicking on the bottom page numbers until you find the price you are looking for.

For $650 your friend can pick up a much nicer gun with better resale value.