This Item is rare.  The maker is A&J Manufacturing Company, Bingharnton, New York.  The company was purchased by Ekco Housewares Company, Chicago Illinois in 1929 after which all products carried both companies' tradmarks.  This eggbeater only has the A&J diamond tradmark indicating that it was made by the original A&J company in New York.

Hand powered eggbeater with wood knob is in excellent working condition and rotates easily.  The knob was originally green and much of the green paint is missing.  Check photos for condition.