Thank you very much for your interest about Japanese roundie.
I would like to answer some questions.
Q1:How old
I think this set was manufactured in 1960.(In Japan,colorcast has started in 1960.)
Q2:How many scan lines
Scan lines are 525 and using NTSC system same as USA.
Q3:What is "GENERAL"
Yaou ELECTRIC Co. LTD used brand "GENERAL" until 1985. Fujitsu(Fujitsu is the famous company about computer in the world as you know.) has merged Yaou and established "FUJITSU GENERAL LTD" in 1985.
http://www.fujitsugeneral.co.jp/english/index.html
Q4:Are there many like it in Japan
The production number of roudie is very small. The set was too expensive for the ordinary Japanese to buy. So,roundie is very very rare set in Japan.
Thanks a lot to everyone
from JAPAN