Thanks all. I don't have a picture of it, and I've not seen it as it's a way away from where I live. All I know is that it is straight, and was purchased from an American serviceman in South America some years ago. Was just an interesting proposition, and a potentially interesting instrument. It's not especially cheap, reflecting a fairly high original price apparently. The main reason for considering it is a) for fun as I'm a tenor player and it would be a nice change, but mainly b) for my son to graduate onto from his clarinet.
I may swing by and take a look and a picture, in which case I'll post it up for interest's sake.