Vintage detachable wing collar, a few decades old but never used.  This is a traditional starched collar.
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 photographs is just for display purposes).
Made by RMM, probably in the 1980s or thereabouts.
Collar size.........14 inches (to fit shirt size 13 1/2 inches).

Condition: These collars are a few decades old, but have never been worn.  They are unsold shop stock from around the 1980s.   They are in perfect condition.