[Arran]

The changer in your machine looks like a VM unit from the 1960s, the original was a greenish blue colour. The good news is that it should not be too hard to find a parts unit with the proper changer and that handle, these sorts of sets have little or no collectable value among radio collectors so most people are trying to get rid of them. One of our group may even have one that they wish to part with, we sometimes buy package deals on sets and get stuck with things like this. I would keep your eyes open at garage sales as well.
Regards
Arran