The Vito YAS-23 serial numbers seem to start at 5XXXXX serial numbers in 1989 and the Yamaha YAS-23 starts in 1980. Each different Yamaha instrument model line has it's own sequential serial number coding. These Vito Alto serials seem to also apply to Yamaha YAS-21 Altos made up to 1980 but not to the Yamaha YAS-23 Altos. Maybe when Yamaha brought out the YAS-23 model in 1980 they did not want the Vitos based on YAS-23 models, as the Vitos might interfere with the initial Yamaha YAS-23 sales if both were the same, so Yamaha kept supplying YAS-21 parts to Vito up till 1989 and by that time it didn't concern Yamaha if the Vitos were based on the YAS-23 model or maybe around 1989 Yamaha couldn't make YAS-21 parts anymore due to factory tool changes. 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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