Talk about RARE, HARD TO FIND, VERY FEW MADE, and no doubt, you'll be talking about this clarinet! For classical clarinetist, this "A" clarinet, is a real asset, as it's helpful aid in the fingering, of some "tricky"  passages. It's approximately an inch and a half longer than the Bb model, unless of course, you need the low range extended to "Eb", instead of the normal "E" in which case, the total length, would be aporoximately 3" longer. We have for sale,  a vintage, rare, hard to find, double  walled "thermoclarinet" in the key of "A". This clarinet is marked "The Haynes Clarinet, Made By Wm. S. Haynes Co, Boston Mass, No 157, Pat Applies For, Regd Trademark", the bell is also marked registered trademark, along with Haynes emblem, approximately  335 of these thermoclarinets, were made from the late 1920's  until the early 1940's, this one is #157 made, however, of the total  thermoclarinet made, the majority were in the key of Bb, very, very, very, few were made in the key of "A" ( of the several we have/own, of these clarinets, only 10% are in the key of "A", the majority of our Haynes clarinets, are all "Bb"). These sterling clarinets, Made by The Haynes Co, in my opinion are the best quality ones made in the whole world, of course, again that is my opinion. This Haynes Clarinet, is no exception, it is a double wall sterling silver barrel, body, and bell- all fabricated from Sterling Silver (that's 92 & 1/2% pure silver -Which as we all know will polish up beautifully). Keys are plated. Of course, the pivot screws, rods, springs, pads, etc, are all made from the materials that are required of them!