Found a Western Electric 555 tweeter, 20 feet up, after climbing a wall of open shelving in a storage shed. I was 'pickin'. The guy had (noshit) 300 vintage (20's-30's) movie projectors, maybe 60 Short wave/CB High end military units, thousands of vacuum tubes (of which I knew nothing at the time), etc. 8,000 square feet of cool stuff. Nearly died, but only paid $10 for the 555.
Sold it to a major collector who flew from Korea to buy it for 4K