The YAS-23's have a smaller emblem in front of the YAMAHA on the same line, followed by JAPAN on the line below. The YAS-23's have big 3-tuning-forks in circle emblem on top, with YAMAHA below and JAPAN below that. That means that the YAS-23 sequential serial numbers are not a continuation of the sequential YAS-21 serial numbers.ġ. The Yamaha serial numbers are sequential for each model and only for that particular model.Įach new Yamaha model starts with a new sequential serial number sequence. The YAS-23 starts in 1979/1980 and the YAS-21 has a removable bell and the YAS-23 has a soldered bell-bow connection. The YAS-21 has a removable bell, the YAS-23 has a soldered bell-bow connection.) The Vito 5XXXXX serial number Altos are YAS-23 models. The YAS-21 seems to become the YAS-23 around 1980 and the YAS-23/25 seems to become the YAS-275 around 2000/2001.ġ989 89759 501000 (Sudden Jump into 5XXXXX serials because the Vito YAS-21 changes to YAS-23. The Vito YAS-23 serial numbers beginning with a 5 like 501000 starting in 1989 do not match the Yamaha YAS-23 serials but the Vito YAS-21 serials from 1970-1980 do match the Yamaha YAS-21 serials.Īfter 1980 the Vito serials don't seem to match.įrom the Yamaha serial numbers and purchase dates I've seen the Vito serials do match the Yamahas for the YAS-21 up to 1980. The Yamaha YAS-21 serials match the Vito YAS-21 serials up until 1980 when the Yamaha YAS-23 is introduced but the Vitos still use YAS-21 parts until 1989 when the Vitos start using YAS-23 parts nearly 10 years after Yamaha introduced the YAS-23.
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