Macrojack, that would probably be the Win strain gauge cartridge system by Dr. Sao Zaw Win.
Those Draco tuners are rare, but before they had a split they were marketed by Sherwood. I have seen a few of those and I believe that they are fairly common for an esoteric tuner.
Lou, almost by definition receivers are mass market goods and most tend to be made in rather larger quantities than more esoteric components. That said, Setton is a rather rare receiver marque.
Those Draco tuners are rare, but before they had a split they were marketed by Sherwood. I have seen a few of those and I believe that they are fairly common for an esoteric tuner.
Lou, almost by definition receivers are mass market goods and most tend to be made in rather larger quantities than more esoteric components. That said, Setton is a rather rare receiver marque.