I'd say yes. Nice piece of history. This one is a 1976 model. I have the identical set. It has a slot mask CRT not the triad holes. Picture quality is better then original but still not good. It has saw tooth jaggies on the screen edges. A few screen shots.
Portacolor 4 525 WP.jpg
portacolor 5 525 WP.jpg
Portacolor SS 4 525 WP.jpg