Not take it on a date! Tell how old it is? I was goofing off in the desert like I do. Ran across a mine that went straight down many feet. I didn't get too close to the edge to find out just how deep it is. I noticed this spark plug on the ground near the hole in the ground. It's an Autolite plug. Looks to be either a #87 or #37. The threads are much larger than todays #87 Autolite plugs. The "A" for Auto and the "L" for Lite are 1 letter. The \ side of the "A" becomes the "L". Hope that makes sense. It looks to be missing it's sealing washer. It's pretty big around. Bigger than todays plugs and the electrodes are pretty worn but it doesn't look like it was oil or carbon fouled. I bet it will still spark! Anyway. I'm wondering if it came from the machine that pulled the ore up out of the mine. Most of these mines were last worked during the great depression so I'm assuming it came from then. Here it is next to a quarter. When did Autolite use that A with the L?