This c. 1952-1955 Platinum squeeze filler fountain pen, in the photo below, has a clear plastic cap and barrel and a price band, indicating it was a production pen, not a sales demonstrator. The paper band shows a price of 550 yen, about $5.00 in today’s dollars. It reads "Gold plated Platinum pen" over "Platinum" over ¥550. This 4 7/8 inch long model would date from at least 1951 when nibs were marked with the Japanese Industrial Standards mark. The clip is stamped R14 at the top, indicating 14 karat rolled gold, above the name PLATINUM. The gold plated steel nib is stamped PLATINUM over 10 YEAR over IRIDIUM over the JIS symbol. The JIS number is unreadable in the section. This arrow clip style, with PLATINUM stamped down the top, is seen on pens dated as early as 1950. The cap and nib section unfortunately shows a lot of crazing, a condition where the plastic suffers areas of fine hairline cracks.
Read the story about this interesting pen here:













