Just one day after the FCC announcement (December 18, 1953) approving the RCA compatible color system, the Milwaukee Sentinal reported that Admiral was already producing color sets in pilot production with plans to introduce them to its distributors on December 30, 1953 at a price more then $1,000, with production quantities increasing by the end of the second quarter 1954. A production goal of 30 thousand color sets were planned by the end of the year.
I found a newspaper article dated February 24, 1954 showing a photo of the Admiral color set in an appliance store and presumably being offered for sale. The article goes on to say it was the first public showing of the Admiral color television in the Pittsburg area. The appliance store moved and was having a grand opening of its new store.
Also found an April 8, 1954 Chicago Tribune newspaper article saying that Admiral was beinging to ship its "second series of color set at $1000, a price drop of $175 from the previous price." announced in 1953.
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Based on this and other information I have, I believe the Admiral 15 inch color set was the first all electronic color TV to go on sale.