According to Bikepedia, the Diamondback WCF 6.1 was made only in 1997 and funnily enough, the picture on there shows a canti bridge. The position of the cable stops appears to be the same, and note that unlike the Trek, the front stops are on the metal, not on the carbon fibre. However both your picture and theirs look to have fatter tubes than the eBay bike.
However the WCF was also made in 1996, and the 1996 colours appear to have been as per the eBay bike. The WCF 4.0 colour was 'carbon orange', implying that the metal was painted and the carbon wasn't. Also the fork was an Answer Manitou Mach 5 Comp XC - does any Manitou expert know whether that is precisely the fork on the eBay bike? And unlike 1997, the frame is explicitly said to be TIG-welded steel/bonded carbon fiber, which is consistent with the slim tubes of the eBay bike.
http://www.bikepedia.com/QuickBike/Bike ... &Type=bike
However the WCF was also made in 1996, and the 1996 colours appear to have been as per the eBay bike. The WCF 4.0 colour was 'carbon orange', implying that the metal was painted and the carbon wasn't. Also the fork was an Answer Manitou Mach 5 Comp XC - does any Manitou expert know whether that is precisely the fork on the eBay bike? And unlike 1997, the frame is explicitly said to be TIG-welded steel/bonded carbon fiber, which is consistent with the slim tubes of the eBay bike.
http://www.bikepedia.com/QuickBike/Bike ... &Type=bike