This info from John A might be helpful: 211068.Īlbert Alexandre Selmer Beaufort Frank Holton HR Buffet Auguste Buffet C Conn articulated Albert HRHP Console Plateau Couesnon HP Grampas no-name French HP Holter Cie Oklahoma USA Kohlert Sons Grazlitz L. I have only found serial number information at for the Signets. Selmer Clarinet Chart Serial Number Information At Selmer Clarinet Chart Full Plateau Unibody.Selmer Clarinet Chart Serial Number Information At.