Proforma Certificate: Tarisio, New York, NY (Oct 24 2022)
Dendrochronology report: Peter Ratcliff, London (Sep 14 2022) Dates the latest visible ring of the bass and treble side as 1724 and 1736, respectively.
Printed report available for purchase upon request.
Certificate: Henry Werro, Bern (Oct 5 1954)
Letter certificate: John & Arthur Beare, London (Dec 13 1926)