BIRMINGHAM, I.M.I. Birmingham Mint Ltd, Kynoch Site Management Association, 40th Anniversary, 1974, cupro-nickel, 33mm, 16.74g; I.M.I. Rod & Wire No. 5 Press, Golden Jubilee, 1980, brass, 31mm, 9.33g; coining Trials (4, one with security edge), in brass (2), both 25mm, 6.16g, 8.31g, and in cupro-nickel (2), 25 and 23mm, 6.26g, 5.54g [6]. Virtually as struck £40-50