“F. Langer” Factory, No. 575.
Germany, Berlin, early 20th century

“F. Langer & Co / BERLIN” — embossed with a punch on the copper label nailed to the side of the box; “Langer” — embossed with a punch on the copper label nailed to the mechanism detail;
“PATENT” — embossed with a punch on the white metal label nailed to the side of the box;
“Д-3 / I-72 (D-3 / I-72)” — a handwritten label glued to the key lever;
“Д-3 (D-3).” — an inscription by ink on the back side of the bed frame;
“575” — embossed with a punch on the back side of the bed frame.

638×88×490
Wood, metal, felt, cloth, bone, glass

Around 1909, arrived from an unknown source
Stock number: 23556/3

The acting double rehearsal mechanism of the “white” grand piano key together with the damper is mounted on the bed frame made of mahogany (see No. 120)