This is the late great Arthur Rubinstein playing Chopin's Barcarolle, Op. 60 in F-sharp major. Supposedly this was pulled from Russian archives and only recently exposed to the general public.
I don't have much information about this video, if you do, let me know. I'd love to put more FYI here in the description.
did you know: this piece was composed only three years before Chopin's death