Vintage Men’s Brown Patterned Short Sleeve Button Down 70s Dagger Collar Small

Vintage Men’s Brown Patterned Short Sleeve Button Down 70s Dagger Collar Small All tags are missing, so I am estimating this as a size small but please check measurements. If I had to guess it is a poly/cotton blend. There is some writing on the inside collar, but I cannot make it out. It has a few small snags and about 6" of the back bottom seam has come undone (see last two photos). It's a very easy fix. Shoulder-to-Shoulder 17.5" Pit-to-Pit 21" Length 31"