A NIB 66 no dash recently sold on Gun Broker for $955, so they're worth whatever someone is willing to pay for it. Besides being good shooters the older 66 no dash examples, being nearly 40 years old have become collector items. The stainless rear sight is especially sought after by collectors. NIB 66s command a premium but any decent 66 no dash with the stainless rear sight will be more valueable then any similar 66-1-2 or 3. I'd grab it while you can.