04-03-2020, 09:26 AM
As I said in my post above, I may know where these things have come from and recent sale of parts at auction fits with my theory. 30 years ago when I returned mine the then supplier told me he had had a batch done but would now remove them from sale. It's reasonable that if they were put to one side by him they might, now, have found their way onto the market.
Steve
Steve