I’ve seen that coat in person, might have pulled the trigger except the promotion to Lt. was post war. The coat was altered to an officer’s coat. There is another very nice coat running around attributed to a Sgt, but is an officer’s coat, the sgt was wounded before his commission came through and never served as an officer due to invalid status. I have his GAR uniform, canteen, cartridge box, belt, war date slouch and stencil, but did not buy the officer’s frock when it appeared, since it was never used.Hindsight is always 20/20 I guess. I'm sorry you missed out on that grouping. I missed an opportunity to purchase a Sgt's Sack coat a couple of years ago, it ended up being sold to the Fort Worth Civil War Museum. I kick myself all the time for not pulling the trigger on it.
Another dealer currently has a LT. frock coat that has shadows on the sleeves where 1st Sgt. Chevrons were removed. It is also missing the light blue trim but is attributed to the 52nd Massachusetts. I was curious why it would be missing the trim and thought maybe it was just a private purchase coat.