While metal detecting, I found a sand encrusted chunk of copper. I gave it the vinegar bath and surprise, out comes something that looks like a nail/spike about as big around as your finger. So I cleaned it some more and it has a flat head like a nail but with a bulls eye design on it, the shank looks to be threaded and is inscribed with SHRAEDER, on both sides. I'm well familiar with the typical pneumatic tire valves, but this would be big enough to fit in one of those monster earth mover tires. The place where I found it was a former harbor area. I also found pieces of a copper pad lock. I'll try to get some pics up after the next cleaning session.
Any Ideas??
