Well I'm not an expert, but I did play one on TV. I do have 4 Charleville's a 63, 66, 68 and an American restocked 66.
I'm not in any position to argure with Moller But my 66 has a lower spring band, also every part of my musket has the same filed number even the bayonet lug and screws, Newman says 68 was the first year for the lower band. The spring bands on the auction gun are thicker then my 66 or 68 more like a 63 and the upper part of the trigger does not match any of mine and the ramrod is wrong.
This was great timing as I'm doing fall cleaning of my guns and these were next. So my guess a standard 66 is when it's mostly 66 parts. I would not call my restocked 66 standard but it is US surcharged along with the 63 and 66