Manuscript, n.d.(mid-to-late 1700s?)
Public Domain [tag/del]
RISM 464140235 (as noted, key is described wrongly, but this is the same.)
||Violin Sonata in G minor
||D-B/ Mus.ms.autogr. Antinori, D. 1 N
||3: Grave - Allegro - Allegretto
Both SBB and RISM have the key as B♭, but the bass at the beginning and end of the piece, among other things, belies this, and it's a normal bass clef G; the use of the occasional F-natural does not make the key B♭ major.