Fabulous Vintage Perpetual Flip Desk Calendar by Brown & Bigelow advertising Hadley Company in the USA.
The date is adjusted by swivelling the calendar one half turn, making the next day ( 1 through 31 ) of the month drop down. The month (Jan to Dec ) and days of the week (Mon to Sun) are each adjusted separately by two wheels on the base that turn manually.
Vintage patina is commensurate with age and use. The calendar is in good working order. Great vintage desk accessory or for the collector.
Measures: 3 1/2"h x 3 1/2" Round