That is a good site, thanks for the link.
Many years ago, I acquired two 25 watt bulbs. I have been using one of them daily for the past 29 years. If it ever burns out, I will be heartbroken. Sure, it’s only a light bulb, but I’ve grown fond of it.
When I pack to move, I treat that bulb like fine china. Actually, I’m more careful with it than the china.
I know the bulbs were made in South Korea, but that’s all I know about them.
Back in the day, we had and sold small 25 watt bulbs for fridge lights. Too fragile for my lead light. Saw a box full of 300-watt traffic signal bulbs in the attic at the Eagles Club when working on a cooler there in the mid 80’s. Tried one in my lead light, but WAY too bright—and hot. Ow!