I have a Monroe Shocks and struts clock with a message board which uses the plastic letters. I tested the clock with a battery and it works. The light in the sign doesn’t work but it probably needs a new bulb. Worn condition but could still be used without a problem. $65 plus shipping or pick it up here in East Texas.
Also, I have an interesting metal “Garage Junkies” Sign made like a stencil from an old local repair shop called Garage Junkies. Perfect for a similar shop or for your garage. $50 plus shipping.