Vintage Time Teacher - educational toy clock (compare analog/digital) in East Hampton, Connecticut For Sale

I'd place the original purchase date of this ?Time Teacher? as sometime in the xxxxs. It still works, but it's obviously used. I've cleaned it off as much as possible, but the clear back panel (which can be removed) still shows a lot of scuff marks as well as a few cracks in the plastic.
The front panel over the 'digital' display used as a test for children learning to read an analog clock still slides easily, and both the hour and minute hands still move with their original clicking-gear sound. As the hands are moved, the time in the 'digital' panel changes to match, and vice versa. The digital time can be changed by rotating the gears extending out of the left and right sides (the green and black gears).
The rear panel can be removed (by removing the four corner, Philips screws) to get at the gears, and the black, green, and yellow ones can be removed. There is a opening in the top-middle of the clear back panel designed to hang the Time Teacher on a nail or other suitable object on a wall.
Measures 6 7/8 W x 9" L x 1 1/4" D and weighs about 10 ounces.