Rob -
You and I could have a contest on who has the most-worn Kenmore dryer drum. Mine is a 1978 model too, but is a 60-series. I bought it for my sister in 1989 for her first apartment. She used it until 2000, when after 11 years and two kids my brother-in-law found out (from me) that it was 22 years old (and the washer 20) and he determined they needed new machines.
I was given the dryer back when they were done, but initially I was going to let them go to the Salvation Army, until I realized what I was about to do and went at warp speed down the road to retrieve them. The dryer spent 7 years in storage, and has been a part time dryer for me since then, however it gets full-time use from about April to October. It's located in the garage, and using it prevents the heat from my inside Kenmore from fighting with the A/C.
I'll post a pic and we can decide which has less paint on the interior. It didn't take well to be placed back into service, and not long after it got a new belt, rollers, and idler, then a new thermostat not all that much later. It's got a bizillion miles on it, but what a trooper!
Gordon