“Erard” Factory, No. 23784.
France, Paris, around 1864

“Erard Facteur de forte pianos et harpes à Paris” — a stamp by black dye on the sound board (under the dampers of the strings of the middle register); “Erard” — inlaid with brass in the nameplate;
“23784” — a stamp by black dye on the pin block (area of the tuning pegs of the descant register);
“23784” — embossed with a punch of the key action (area of the hammers of the descant register);
“DESPIERRE” — a stamp by black dye on the bridge (area of the balance pins of the strings of the descant register);
“Bader / 1864” — a handwritten inscription by pencil on the side surface of the lever of the key a of the four-line octave;
“А. № 4. / … Шува…(Shuva)” — an ink inscription by pen on a paper label glued to the back of the case (a fragment of the label remained);

1300×1145×630
Wood, metal, bone, fabric, felt

1925, transferred from the Shuvalova House Museum
Stock number: 16516/1148

The key action is hoppered. There are 2 pedals: the left pedal is used to trigger the “lute” register. The case is veneered with rosewood, completely covered with marquetry (floral andgeometric ornaments) in combination with bronze plates and 4 putti (upper putti serve as candlesticks). The plate on the upper front panel is a musette with the double engraved inscription “MOZART”. The 1st bar and part of the 2nd bar of Don Juan's part accompanied by piano from Don Juan and Zerlina’s duet “La si darem la mano” from the opera “Don Juan” are inaccurately given on 2 musical staffs. The notes are accompanied by the inscription: “LA CI DA REM (sic!) LA”.