Mozart - Complete Piano Sonatas performed by Elżbieta Stefańska on a pianoforte WH-220 replica after Antonio Walter, Wien, ca 1795. Recorded and published in 1991 by Canyon Pony, Japan.
Elżbieta Stefańska was born in Kraków, Poland, the daughter of the pianist Halina Czerny-Stefańska and piano professor Ludwik Stefański, her first teacher. She graduated from the National Music University, Kraków, in the harpsichord class of Hans Pischner, and in the following years participated in masterclasses in Siena and Weimar with Zuzana Růžičková, Ruggiero Gerlin, and others.
She was awarded prizes in 1964 at the Łódź Early Music Competition in 1964 for her piano and harpsichord performance of baroque works. The following year she won the Principal Prize at the International Music Competition in Geneva, with the Henri Ghez award as the best harpsichord player.
She is a professor at the National Music University of Kraków where she leads the harpsichord class and where, from 1981 to 1990, she was Head of the Department of Harpsichord and Early Instruments.
My own flac rip of the 6 CD boxset and scans.