Certificates & Documents

• Certificate: Helmuth A. Keller, Philadelphia, PA (1974)
• Certificate: Pierre Vidoudez, Geneva (1969)

Cozio holds copies of many certificates and other documents, some of which are available to view on request. Please contact us if you wish to view a particular document. (Note that we do not always have permission to share documents.)

References

• Bonhams Musical Instruments Auction Catalog, June 20, 1995, London, Bonhams, Bonhams, London (illustrated)
• Butterfield & Butterfield Musical Instruments Auction Catalog, February 9, 1998, Los Angeles, Los Angeles (illustrated)