![]() ![]() My Vito 7131 has a 031XXX serial number which dates it to 1977 from the serial number chart below and it's a YAS-21 Vito with a fixed thumbrest so for my Vito 7131 the serial chart seems to be correct.Īs far as I know the Yamaha YAS-21 changes to the YAS-23 around 1980 but for some reason the Vito YAS-21 seems to change to the Vito YAS-23 around 1989 with the 5xxxxx serial numbers. I've found the Vito (Yamaha) Alto 7131RK Japan stamped (YAS-21, YAS-23) serial numbers info that must have been released by Leblanc at some stage (Leblanc got them from Yamaha of course) on Leblanc clarinet serial sites.
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