If it had SS sights, the original box, the original football stocks, tools, paper work, etc., I've seen truly 90% guns go for $650 to $700. I would deduct for every deficiency the pistol has from that ideal base list. Without seeing the 66 I would say that price is an extremely good value that should only appreciate in value....
BTW, I've seen several brand new, all original in the box very early 66s (SS sights) sell for $1000 recently and the interest in this particular model is growing.
JMHO.....