I can’t imagine that many of these FOBs were issued, Players & support staff, maybe some to committee members would have received them, so possibly somewhere between 20 & 30. Exact number is unknown. Weighs approx 9.6 grams & measures 34mm high x 22mm wide. The rear of the FOB is hallmarked Birmingham with the date letter W for 1921. No history is known about the item. RARE !!!