Hi guys, new to the forum. For my first message (or post I guess) I wanted to ask about the US&S HC81 8 inch light, since I recently bought a pair. Here is a video of similar lights to mine (https://www.youtube.com/watch?v=1hApI6UcnuY)

When were they made?
When did they stop making them?
How rare ...

Those old pinnacles are amazing.
Back when railroads cared about looks