National Guard Officer's Uniform 1920s

[oakleaf777]

I recently added this one to my collection. The DUIs are for the 101st Inf Regiment, a Massachusetts National Guard unit. The uniform is unusual, to my knowledge anyway, due to the seams on the back, which look like they would belong on a M1912 pattern service coat, and not a M1926 pattern coat. I cant find any similar looking pre-WW2 M1926 officers service coats which look like this one in the reference sticky. The Tailor's label on the inside pocket is mostly gone, and provides no useable information. If anyone has any further information or observations about this uniform, I would appreciate it.

 

 

[doyler]

Possibly it was tailored to an open collar from an earlier stand up collar? or copied from one?