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Notes:

* The Yanagisawa 1 series is probably the original prototype of the 3 series and was built in 1951. I'm not aware if any prototypes still exist. (Source.)
* The Yanagisawa 2 series is the "training model" horn with reduced keywork and reduced range. It was introduced in the mid-to-late 1970s. It's possible that there are tenor versions, but I've only seen altos. (Source)
* The A-4 low A alto was never released to the public. It was produced between 1968 and 1970. (Source.)
* The A-7 solid silver alto was prototyped in 1972. It was not released to the public. (Source.)