Vintage British Van Heusen detachable shirt collar. You will need a pair of collar studs to fix this collar to your tunic shirt.
Patent semi-stiff collar, made in England, probably in the 1950s or thereabouts.
White cotton.

Size  14.5"
Style number 52

You will need a pair of collar studs to attach the collar to your shirt.
These studs are available separately from my other eBay listings.

Condition:
Unused, in perfect condition.