Style 11 - RAF.
Made in England, roughly around the time of the Second World War.
There is some variation of details on the packets, and also the patent numbers.
Various collar sizes available (please remember that, unlike some brands, Van Heusen collars should be the same size as the shirt).
The collars have never been used.
You will need a pair of collar studs to attach the collar to your tunic shirt.
These studs are available separately.
Vintage collars, unused, in excellent condition, and still in their original waxed packet.