Alexander Berridge Kay (1879 – 4 December 1944) was the founder, with E.J. Bridger, of the stamp dealers Bridger and Kay in 1897 or 1898 and a leading figure in the Fiscal Philatelic Society. In 1910, Kay identified used copies of the Italian forgery of the British grey-green Victorian 10 shilling stamp watermarked anchor and perforated 14. His letter to The London Philatelist, published in November 1910, warned the philatelic community of its existence.