Vintage detachable turndown collar for day wear, about a hundred years old but never used.  This is a traditional stiff 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. 
Probably made near the beginning of the 20th century.
Collar size.....14 inches (to fit shirt size 13 1/2 inches).

Condition: These collars are about a century old, but have never been worn.  They are unsold shop stock from the early 20th century, and they are in superb condition.