Ours was the DG502
in white. It was a reliable dryer, ran nicely from 1967, through the 1980s. Easiest dryer ever to program!
I did not like the dark drum in a dark basement, but we had a flashlight with a built in magnet attached to the side.
I suggest that every three months or so, you vigorously scrub the drum vanes (moisture sensors) with a damp terry cloth. Preferably a different clean cloth for all three vanes. Keeps the sensors from gunking up.
Congratulations.
Lawrence/Maytagbear