I was at a house last night, which the current owners have inhabited for 33 years. They have two chandeliers that have had the same light bulbs for the entire time. It is not impossible that those bulbs could have been there for 20 years prior to them moving in. Extraordinary!
I asked my friend if there is any brand or imprint on the bulbs (there isn’t), with the thought that it could guide my future light bulb purchases. Upon reflection, this was very foolish of me. If this company makes light bulbs that last decades, how could it possibly still be in business?