I would think you would be able to find US pianos from the fifties.
Stay away from anything shorter than the Yamaha you first showed. Remember, the younger the better - pianos age structurally from changes in humidity.
Thanks again for your replies! Isn't a piano from the 50/60's a bit too old? The problem is I really don't know what's better or worse than the Yamaha.I'm having a LOT of problems finding a piano at an affordable price, but nothing I can do about that...