Van Buck Maths & School Blackboard Novelty Bow Tie. Unique bow tie with maths sums & equations on a black bow tie. Ready tied luxury bow tie with easily adjustable neckband. Fits neck sizes 32cm to 60cm, 14" to 24". Presented in attractive gift box. Made in the UK. 100% Polyester. Designer: Van Buck. This bow tie is an original unique item and may differ slightly from the image shown.