One of my favorite Japanese pen companies from the 1950s is Platon. They were famous for thier celluloid pens and the picture below is of one of their better models. This one is in clear blue. Note the sticker - Y500. This was a higher price than for what they sold makie pens of the same size. How incredible it is that clear plastic could sell for more than an artists time. I've heard that some of the makie artists they hired were ex- or under-employed Pilot people. Platon closed their doors in 1953, so it might be possible as during this era work was scarce and money tight.
Anyway. Just another of the wonderful vintage Japanese pens out there..
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