There is always something new. What is the oldest working piece of photographic equipment you have? I have a General Electric light meter, Model 80W58Y4 that is a reflective meter that is powered by selenium, if memory serves me. No batteries required. An internet search provided some information on the model W68, but nothing so far on the W58. I have no idea how old this model is. I used the meter, when necessary, to determine proper exposure when using 8 x 10 sheet film with bellows cameras, including field and studio models. Both my Father and my Grandfather used these meters before me, under the same circumstances. Cameras have had built in meters for decades now, and these meters are not of much use. Selenium meters degrade over time and accuracy would need to be tested, if it were to be put back in active duty. So I ask, what is the oldest working piece of photographic equipment you have?