10.B.1
Location:
Last in private collection of the Della Nina family, Chicago (a digital reproduction of the photocopy is available at I-Lgp).
1 leaf, recto only (the verso includes a 2-bar autograph sketch of a keyboard piece and a grand staff with a violin and a bass clefs written by a different hand), 2° with 12 staves, 23 bars.
No. 2 in Bernardoni 2017a, p. 98, also including a transcription of the first 4 bars of the source.