That's pretty interesting. The engraving looks like the Beaugnier-era, but that bell to body brace is different. The right-hand bell-keys sort of look like the later Yamaha "Made in Japan" horns, but not really that either. This is the best serial number list I know of for the Vito mystery saxophones:
There is no other writing I could find, no "made in xxxx". I have looked carefully. I have included three pictures you asked to see. The left-hand pinky table look like and a close-up of that bell-to-body brace. (I think)
Looks like it has the distinctive teardrop-shaped left-hand thumb rest that the Beaugniers had. If it's related to the later Yamaha Vito's it looks like they were trying to give it as many Beaugnier features as possible, and I sort of doubt that. It's amazing how many variations we see under the "Vito" name, and this seems to be another one. I agree the 'X' could indicate something...like "experimental".
A forum community dedicated to saxophone players and enthusiasts bought to you by Harri Rautiainen. Come join the discussion about collections, care, displays, models, styles, reviews, accessories, classifieds, and more!