This fan is an emerson 27666 which was made from 1919 to 1922. In the days before the overlapping blade was developed fan companies made fans quiet by decreasing the speed by a third while adding 50 more blades.
Repeat 1930s Zephyr Or Signal 28 Inch Short Pedestal Vintage
Vintage Emerson Electric 4 Blade Oscillating Fan 77646 As Industrial
Old 1939 Retro Emerson Electric Fan 77646 As Runs Quiet 29537601
It is a 12 inch fan and it has six blades instead of the usual four.
Vintage Emerson Electric Oscillating 3 Speed Fan Type 77648 Os Art
Emerson Electric Fan 79648 Ax Vintage Theunitel
Tubetime Blog Archive Emerson Fan Blade Removal