This clarinet is likely a Klarino, a lower version of the instrument and the charm comes from Epirus. It is an isolated mountainous area in northwestern Greece, south of the border of Albania. It's isolation meant that it was free of outside influences and developed its own spirit without interference which is where the "charm" comes from.
sorry, but I think, this clarinet must be under a special charme...hear it and hear it and herar it again...what a wonderful mega beautiful playing from Dimotika Ipirotika...