Thanx for the vote of confidence on my analysis. I do wish there were enough info to conclude which 4th GA Cavalry it belonged to, altho' I lean toward Avery's in the matter. Your info on the other commands in the AoT using the Charleston flag, plus the fact that Clinch's regiment was fairly new in its assignment to the AoT and was very likely still using a Charleston flag, push me in that direction.
On a different subject, I had a number of relatives in the 26th GA Volunteers and have been looking for its flag. The state of Georgia has one they claim to have belonged to that regiment. It's a typical square AoNVA-type of flag but it's in pristine shape. That's not what I would expect of the battle-flag of an infantry regiment that fought in every major engagement of Lee's army from mid-1862 to Appomattox. It would appear to have been a recent issue or to have been misidentified. Do you have any thoughts to share on that ?