Believe that would be Panasonic's CT-101, with an approx. 1" CRT. These were about the same size as their handheld b/w sets which were produced up until about 1985. I've a number of the b/w's but sure would like to get ahold of this color set, one of which was on eBay recently. Sharp made a 3" color set, #3LS36, which attaches to its power supply base like a pod but can be used on 12VDC with an optional cord. I think these came in black, red, white, pink and possibly other colors. Cute sets.
Nice find, by the way! I pick these up when I run across them, just because they're little and when you shrink the picture down on a 4-5" screen, these detail and color's great!
Michael