No ideas at the moment LM, except that on past form it's unlikely to be American, WK has a prediliction for the French, but it doesn't really look like that does it.
Lunch break now, so a chance to trawl, I will have to get some books though, I've only got an Observers '59 (I think), but haven't seen it since the last move and a '62 Green's World Aircraft Directory, so everything is off the Web for me and it seems that my favourite search engine isn't a patch on what it used to be!