Very nice Pong using the rare NTL 600 chip. These Pongs were made in Hongkong and sold by several companies like Novex, Derby, Match, Soundic, Optim and Hanimex. Please note Optim consoles could often be found inside "Technigraph" labled boxes like for the pictured system here.

Thanks to Andrew "prinztronicman" Jenkins for this picture!