Hi SeaDog and welcome to the forum.
Like you, we started caravanning in the 70's, before Wastmasters were available and you just had a bucket under the pipe to collect the waste water, a foot pump in the caravan floor for water in the sink, portapotties and we recall the gentle noise the gas lighting made, situated above the table where we played scrabble or spread out the maps for the next days outing. We don't miss hitting our heads on it though and breaking the mantle, which we were forever doing! We had solid glass in the windows too, which used to run with condensation every morning and no Hekki in the roof, like we have now. But great days and we cut our caravanning teeth in the highlands of Scotland, for many years, where we were living at the time.
By the way, we love the picture of the pooch!