About forty years ago, I owned and then stupidly sold a B&H alto. It was silver with black buttons, and I would guess fom the 30s. What made it unusual was that all the palm keys were articulated. In other words, if you wanted top F (there was no F#, if my memory is correct), you simply palmed that key and the others (i.e. D, Eb, E) would open automatically. I’ve never seen once like it since - ahough I do see the odd B&H alto for sale on eBay. I have tried to track down the man to whom I sold it without success. Does anyone have one for sale, know of one or have I just dreamed it all?