VINTAGE Graymark Handcrafted Binary Clock Model 540

Originally recorded August 16, 2018.

My friend Brian found this at an estate sale near his house, some old man who was into nerdly pleasures had this. This is a Graymark Handcrafted Binary Clock, Model 540. Made sometime in the early 1980s. The LEDs that were used in the display are some of the only ones commonly available at that point in time. As expected, a piece of old electronics still works today!

This is not a clock for those of the non-nerdly persuasion. It's an excellent conversation piece, especially for like-minded individuals. For non-like-minded individuals, if you can explain how to read it to someone else, you'll appear super smart!

See Brian's channel at    / bmccarron81