The first Sylvania 21" round chassis that was not an RCA clone was the D01. I have a DO2 that needs a tuner cluster and I believe the first rectangular set., found in late 1965 magazine advertisements.
Sylvania D02 tuner.jpg
The later color models had the tuners side by side including the D16 hybrid. This "Gibraltar" chassis series started with the D08 or 9 IIRC.
There were some 13" and 15" sets and even some of those came as remotes, according to the Sams.
The "holy grail" standard for a remote set may be the E01 that was very worthy competition for the Zenith CCI flat SS chassis, RCA XL100 and Motorola WID.
At a dealer in the early 80's I saw a lot of the E-sets on the bench and the consoles in the home, and liked most of them, especially the 19 inch ones. They looked about the best of all others when set up right as may on this forum would agree.
The E01 chassis began the series lasting even after GTE sold Sylvania to NAP in the mid 80s. E01 was mostly in consoles and had the electronic tuning making is somewhat unique in that era.