This light was installed in my parents house when the house was built in 1963. It has the original light bulb (for years we have wondered how we would change the bulb as it is in the entrance-way in a split ranch. We have speculated we would either have to go into the attic or rent scaffolding. In any event, after 51 years (albeit it is no longer used everyday anymore) the same bulb still works after 51 years!
This is hard to explain, to say the least.
Oremus pro invicem!