Westclox Big Ben Loud alarm S4-D Case style 5a, windup, 2 key, alarm clock. Date 1939 - 1946 Case Black painted metal with nickel plated trim around the case and on the base. Dial Paper. Other Patd. U.S.A 1563431, 1709146, 1848520, Des. 114262, Made in the U.S.A. There were basically 3 versions of the style 5 5a Big Ben. The chime alarm, the Loud alarm with a carrying loop and the Loud alarm without the loop. The S4-D S4D clock was available with either a plain (white) or black (glow-in-the-dark) dial. Loop is used for carrying the clock, NOT for hanging on the wall .

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