To compete with the rest of the world, Zenith engineers had to design a more compact radio than the coat pocket sized.  The emphasis had to be on portability and low cost.  Zenith started this venture with the Royal 50 which was a huge success.  But they didn’t stop there.  Through continued engineering improvements and style changes, Zenith produced some of the finest looking and performing shirt pocket sized transistors available during the early 60’s.  For a look at most of them, check out the photos below.  

Check out these Shirt Pocket Sized Transistors radios.

Black Royal 16 Clamshell
Brown Royal 16
Brown Royal 16 open
Ladies white Royal 16 with floral grill
Compact Royal 20 in Ivory
Royal 25C
Ivory Royal 100
Royal 130 with case and guide
Royal 185 back with stickers
Royal 185 lighted dial
Zenith Royal 11
Turquoise Royal 80
Turquoise Royal 85
Pair of turquoise and brown Royal 130's
Compact Royal 20 in Black
Solid State Royal 13 in White