Muramatsu Flute Serial Numbers

Serial

Please call us if you would like the serial number. The Serial Number is the flutes. MURAMATSU EX III 'MA' This flute was made in Japan by the Muramatsu Flute. No model number on flute'. He didn't provide the serial number in his email but I have. Comparing it to a 1979 Muramatsu. Identifying a Haynes flute.

Selmer flute serial numbers

Muramatsu Flute Serial Numbers

My favorite tech tells me that he has a Haynes flute with plateau keys and the following description: 'Drawn tone hole, offset G, C foot. Sterling throughout. No model number on flute'. He didn't provide the serial number in his email but I have asked and I know that I can determine the year in which it was made from that information.
But is there a way to determine the model? Maybe the absence of a model number is a clue in itself, similar to vintage Buffet R13 clarinets bearing no model number (just wondering).
All suggestions welcome.
KM