Now I know there at least 2 Sigma CR-9s in the world!

I have one purchased used for my late wife about 25 years ago - paid $350 for it with a hard case. It is a very, very fine instrument - deep full sound, very nice neck, very playable. I have been unable to find much info on the CR-9 - there is a little on the 'net re the CR-7, but hardly a mention of the 9s. There is a listing in a guitar reference book a luthier friend has, but it gives no details - just that it exists. If anyone knows anything more, I'm all ears...