Identified WWI 657th Aero Squadron Tunic

Model 1912 jacket with double seam cuffs and rimless eagle buttons. Sewn on the left sleeve is an uncommon 657th Aero Squadron patch, a discharge chevron and two gold service chevrons. On the right sleeve is an Air Service corporal chevron with bullion wing and propeller. US and Air Service collar disks. There is a 1/2″ hole under the left sleeve, remainder of the exterior shows no damage. The interior exhibits a 1 1/2″ area of damage along the button hole edge, remainder is very good. Very hard to find patch, doubly rare on an Id’d tunic.