Vintage starched wing collar, with rounded tips in early 20th century style.
The collar is stamped:
ARMY & NAVY CO-OPERATIVE SOCIETY LIMITED
BOMBAY & CALCUTTA
The company was only known by this name until 1934 (when it dropped the "Co-operative Society" part).
So the collar must have been made before 1934.
Among the laundry marks, there is one that looks like a date: 7/5/29.
Presumably this was the date the collar was bought - though whether this was by its first owner, I do not know.
Style is called Kingsley.
Collar size 15 1/2 inches.
Depth 1 3/4 inches.