Vintage Patrol collar, of the type worn in the British Armed Forces.  5 button/stud holes to fasten it to the neckband.  Made in England by Gieves & Hawkes of Savile Row, probably around the 1980s.  Total depth is one-and-three-quarter inches at the back.

Collar size 18.5".

Condition:Vintage collar, clean and starched, but with some small marks from storage, as shown, and noticeable wear and fraying along the top edge.  Might do for re-enactment or display, but not suitable for ordinary use.  Previous owner's laundry mark inside collar.