So that there is no question in the mind of the listener, I rely principally on images of the LP and LP jacket in order to document the authenticity of historically important recordings such as these.
Thirty year-old Maria João Pires is soloist in this 1974 recording of the third movement of Mozart's 21st piano concerto in C major, K. 467. Theodor Guschlbauer (b. 1939) conducts the Chamber Orchestra of the Gulbenkian Foundation of Lisbon.
I created this video from the LP depicted above, issued by the Musical Heritage Society (licensed from Erato), serial number MHS 3737. This recording is dated 1974; it was re-issued by MHS in 1978.
The Library of Congress online catalog entry for this recording is available for review here: http://lccn.loc.gov/77751012
Movement 3: Allegro vivace assai