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 17.5"
Vintage collar, in very good condition, but with one or two tiny pinprick-size marks from storage, as shown - these may come out in the wash, but this cannot be guaranteed. Previous owner's laundry mark on inside of collar.