This doesn't have anything to do with HVAC but with my old job we got a contract to help rebuild old trams and metro locos on the Moscow Metro. We'd spend time in Moscow at the Ismailovo yards. One day when there wasn't anything to do I was going through some old trams way back in the yards that had been sitting there for god knows how long. Some of the stock had the city name Smolensk on the sides and even had bullet holes in them. Anyway I was poking around in a motor box and found a 1933 1 ruble coin with Lenins head on one side, hammer and sickle on the other. In almost mint condition. I also found hand made wrenches and pump pliers. The guys there told us that in the Glorious Soviet Union back then you had to make a lot of your tools from scrap. While it isn't necessary today a lot of the guys there do just for fun.
Although it took about 3 weeks,I traded a guy in Italy who's into war stuff,a paratroopers helmet that was refurbished for an olive drab beer can that was made for the troops and sent overseas.He was amazed to learn his can was worth 250.00,and this helmet he wanted was on ebay.Trouble was...the seller would NOT ship overseas.I bought it,reshipped it and got a new can for my shelf.
I think he was expecting ten or twenty bucks for it.