An Aristocratic Family Bought in the 18th Century a Former Monastery near Augsburg as Residence and brought from the North of Germany a Harpsichord for the Music Room.
I have Found the Instrument in 1984 on the Loft, Aquired it, and have Sold it Later to the „Berliner Instrumentenmuseum“.

Together with Historians and Musicians I have done a Lot of Research about this Instrument.
Interior, on the Bottom Plank, is Written in Pencil:
Josephus Glonner: Hoff: Clavecin Macher:/ in München verfertiget den 29. July ad: 1765.

I have Found No Other Signatures.
Considering the Range of AA-d³ and the Style of Decoration, we should Exclude, that Glonner, which Worked during the Time of Mozart for the Court in Munich, has made it.
His Signature Represents the Date, when the Instrument was Converted to a Combined Harpsichord/ Fortepiano.(some Rests of the Pianoaction Survived)
Before it had been a Harpsichord with 8´8´ Stringing and 3 or 4 Rows of Jacks.

After a Analysis of the Measures with the
Method of Hubert Henkel, the Instrument could have been build in Thüringen (Thuringia).

The Instrument had a Device for the Keyboard to Switch the Registers On and Off by Sliding the Keyboard.
After Jacob Adlung: „Musica Mechanica Organoedi“ (edited in Berlin 1768 by Johann Friedrich Agricola, a pupil of J.S.Bach!) the Clavier- and Organ-Maker Johann Nikolaus Bach Invented such a Device before the Year 1727.
Adlung is Praising Johann Nikolaus Bach as Maker of
Excellent Sounding Harpsichords with a Light Touch and Veneered Exterior.

Johann Nikolaus Bach (1669 - 1753) was a Second Cousin (the Grandfathers had been Brothers) of Johann Sebastian Bach, and it is Reported, that they often had Personal Contact:

Therefore this Instrument must be seen in Close Relationship to the Music of Johann Sebastian Bach.

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