A advertising Rotating Perpetual Desk Calendar for DYLON Dyes of London. 1 to 31 celluloid flip down days and seven days of the week rotating dial for the days of the week. To change the date and day together you press the top knob, the day can be changed by rotating the dial from underneath. on the back is stamped in gold “DYLON Dyes of London” This seems to be made from plastic with a stitched on cover of leather,

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