Front left to right: Hardy St. George 3 ¾’’   first model with single drum securing nut, 1910 Check  (1910-1912) and 3 ¾’’  Silent Check (1920-1926); Back left to right: Hardy St. George  3 ¾’’ Duplicated MK II Check (1940’s)  and 3 ¾’’ Single MK I Check Ivorine handle  (1917-1921).