Odd. I possess two 364s, one in C and one in G. They are unvalved. I don't recommend these harps (sorry, Hohner). They are very fat in the mouth and they have wooden combs which are a real pain. Both mine needed an awful lot of tweaking to get them playable. Much better these days to use 10-hole harps in the Paddy Richter tuning. The XB40s referred to are wonderful as long as your bending technique is perfect and that you are able to resist the temptation to overdo it.