Nick Carroway has an upright Brunswick at his cottage where he can listen to classical piano while eating supper on the porch...
Tom Buchanan has a Victor Victrola (that seems to play post war 78s at a very slow speed

and last but not least... Jay Gatsby has a small laquered art-case baby grand piano console (that sounds quite loud even with the tone chamber cover closed

I do not remember this off brand but it has a supported tone arm similar to Victor and I remember seeing almost the same model console at Union a few years ago...