Antique upright "cricket" collar, presumably late Victorian.  Appears to be made of celluloid, possibly with some linen content.  Total depth is one-and-seven-eighths inches at the front.  The collars have quite a fierce "snap" action if you try to straighten them out, more than in most celluloid collars.  There is no maker's name, but the size is marked in centimetres, so they may be European collars.

Size:  Marked as size 46 cm/18 inches, but it actually measures as size 17.5 inches.  Probably best worn with a size 17 shirt.

Condition: Antique collar, clean, unused, and in superb condition, but with some tiny marks from storage, as shown.