Cant tell 100% but probably a gen -2 system 3 type chassis.
To be labeled System 3 must have RAT tuning, color
sentry, EFL CRT & comb filter. S-3 is a feature list
NOT a chassis name for the style.
Anyhows what ever it is its a good looking set. CRT seems
VERY strong & almost any problem is easy to deal with.
73 Zeno
LFOD !