That's Another....
....Ozzie and Harriet fridge. As the show's sponsor, Hotpoint changed out the appliances very frequently; the kitchen stayed the same for many years, but Harriet always had the latest and greatest Hotpoints. The company also gifted the Nelsons with appliances for their real houses, though not nearly as often as they changed the appliances on the show. The Nelsons had two houses - the Camino Palmero house you see in the opening credits of the show, and a beach house. The beach house was sold as a teardown a few years ago; when it was sold, Harriet's 1955 or 1956 40-inch range in stainless was still in it.
Hotpoint even continued supplying appliances for the set after they dropped sponsorship; I have 1958 and 1959 episodes where Kodak is the sponsor, but new Hotpoints still reign in Harriet's kitchen.