>....the collector mentioned to [Charlie C] that he and you had corresponded about the landing guns back in the 1990s. If that rings a bell with you, you will know where to find the collector and ask him those questions yourself. >
Yes, that does ring a bell and I know precisely the name of the collector. The trouble is, that was 17 years and two computers ago, and I’ve lost his email address. Could you go the extra kilometre, contact Charlie C (I have no contact info), and ask him for the Oz collector’s current email address. I shall take it from there. As I’ve written, the answers I seek are essential.