@sevenjamesr,
If you google "sheraton furniture" then press image, you will see a page full of elegant mahogany pieces, mostly with thin, tapered legs with intricate design detail.
I am afraid that your piece is (imo) not that old and has a much lower level of craftsmanship.
As previously mentioned, the top has been replaced with ply, and a homemade upholstery job has been carried out.
I think it is pretty much mass produced, probably in the 50's, and over here in the UK you could find such a thing for a fiver in most old junk shops.
Sorry.