Vintage Martus detachable wing collar. Style 54. Height just under 2 inches at the deepest point. You will need a pair of collar studs to fix this collar to your tunic shirt. These studs are NOT included, but are available separately (the stud in the pictures is just for display).
Size: Collar size 16 (to fit shirt size 15.5).
Condition: Vintage collar, several decades old, but in excellent condition.