You should have a nice shooter. $800 in today's market is about right. 10 years ago they were $550. As little as 3 years ago one for the same $550 might be available through vigorous searching and lots of luck.
Very well could be a low round count gun. The TT, TH and trigger stop could have been done to a base 66-2 by a gunshop or gunsmith at time of purchase or anytime during last 40 yrs. The grips probably weren't original to the gun. OTOH the gun could have been ordered as you now see it.
The finish could have been restored to what we see today by someone who was skilled and handy with tools. Regardless gun likely wasn't used a bunch previously, because the cylinder notches are crisp. Shoot and enjoy!