My 'good' charger was passed down from my Dad. Big old wheeled charger with no name and all markings long gone. He got it when he bought a small Mobil station in 1959. As I recall it was pretty new at that time. He sold that lease but kept charger and a few other things when he opened an auto salvage a couple of years later.In case you don't remember the "old days" so well, what you bought back then was quality. If you bought any kind of appliance like a refrigerator, stove, or even a batterty charger, they worked and worked well, and for many years.
Today they sell a lot of junk that is marginal at best, and have high failure rates. That is the reason for the "no hassle" return policies.
I'm still using a battery charger that I bought 45 years ago, and it works perfectly. Other items like drills, grinders, and a host of power tools that simply keep on going nearly a lifetime before finally wearing out. I'll take the "good old days" any time when it comes to appliances and tools.
It has never had any internal repairs but does need a new gauge and timer. It does 6 and 12. The lack of a timer and my poor memory has costs me a battery or two over the years. Should have bought a timer, cheaper than batteries now!