Rachmaninoff had what today we call endorsement deals.  Steinway, of course, and for record and piano roll companies amongst which His Master Voice. Imagine that was portable in those days... Rachmaninoff later endorsed record-player equipment for the Magnavox and Capehart brands..

From the collection of Gregor Benko.

Sergei Rachmaninoff plays the famous Prelude in C# minor Opus 3 No. 2, recorded in two different takes on 24 April 1919 at the Edison Studio in New York City.