The circuit design is a delight to the (my?) eye, right down to the colorful parts used. Here's proof that functional sculpture can be beautiful. The five glass-covered transistors are the first type National made, as are the glass-covered diodes. The shape and classifying numbers used tell the story, but it is interesting to note that National was the only Japanese maker to acquire its license for transistor design from Philips in Europe.
Transistors: OC44, OC45, OC71, OC76 x 2 [Diodes: OA70 x 2]