| Paper |
 P51
 |
| Date of use | 1774 - 1775 |
| Paper mill | Vincenzo Vicario, Toscolano |
| Commentary | Similar to P28. |
| Concordances | Tyson A 64A, Bartha/Somfai 173 |
Watermark P51A
| Watermark | 3 crescents |
| Selenometrie in mm | xy: 21, xz: 81 |
| Countermark | VV (appearing as W) in crowned coat of arms |
| Source | A Wn Mus.Hs._17801_2_fol72v71r66v65r |
 |  |  |
| watermark | countermark | sheet  |
Twinmark P51B
| Watermark | 3 crescents |
| Selenometrie in mm | xy: 20, xz: 81 |
| Countermark | VV (appearing as W) in crowned coat of arms |
| Source | A Wn Mus.Hs._17801_2_fol70v69r68v67r |
 |  |  |
| twin watermark
| twin countermark
| twin sheet |
Copyists and works |
|
| Copyists using paper P51 | WK71A, WK71D, WK71F, WK71K, WK71M, WK71Q, WK72E, WK72Z, WK73N, WK73U, WK74A, WK74B, WK74C, WK74F, WK74G, WK75A, WK75D |
| Scores written on paper P51 | Anfossi_18046, Gazzaniga_10029, Gazzaniga_17777, Paisiello_17800, Paisiello_17801, Piccinni_17824, Piccinni_OE–27, Salieri_17842 |
| Staff ruling on paper P51 | 10/189B |