Actually the westy has around 26-28 survivors known so you'd need all your fingers'n toes plus a friend with about half theirs. It is the second highest surviving 15" color to the CT-100 of which somewhere in the neighborhood of 200 still exist.
3rd place seems to be RCA model 5 prototypes at 12 then a gradual slide down to 0-1 known for some.
http://www.earlytelevision.org/color_database.html
It is great that more are coming out of the woodwork. The more that we can preserve the better.
