Made with white non-luminous dial or black luminous dial. 1972 - 1973 catalog shows style 3 Scotty, 1973 - 74 catalog shows style 4.
Examples examined:
9 59 brass movement, FLAT barrel bridge (is it original?), removable bezel
11 59 brass movement, nickel barrel bridge, removable bezel
END: MOVEMENT SCREW IN LINE WITH STEM
9 60 brass movement, nickel bridge, no screw in line with stem (but bridge still has the hole for it, removable bezel
START: NON-REMOVABLE BEZEL
5 62 brass movement, nickel bridge with no hole for stem screw, non-removable bezel.
START: MOVEMENT 90001
12 63 Movement 90001 brass, black paper luminous dial
11 64 Movement 90001 brass front plate, nickel back plate, paper non-luminous dial
10 ?9 (possibly 10 69) Movement 90001 nickel plates, paper non-luminous dial
END: NICKEL-PLATED BRASS MOVEMENT PLATES
START: ALUMINUM MOVEMENT PLATES
START: RIVETED PLATES
3 71 Movement 90001, alumimum plates, paper non-luminous dial (information from Gary J. Boggs Jr.)
? 71 Movement 90001, alumimum plates, paper non-luminous dial
7 71 Movement 90001, alumimum plates, paper non-luminous dial