Hello, a quick update.....
Well it is Christmas after all so I’ve gone and done it. Guess I should have asked the question before buying; it’s a 503 J. You guessed it, can anyone identify the J?
Well in fact I thought I was being clever, and bought a machine from Canada in the hope the voltage was be correct, but no it’s 110v but the reason for going for this one is that it’s pristine condition and has the original sales receipt. The guy tried very hard not to sell it to me, because of the packaging but we came to an understanding. Ahem.... postage was more than the machine. Stupidly, going to Canada also means it’s outside of the international postage import thing so I might have a bill for import tax, depending upon how the guy describes the transaction.