This Yahoo auction just ended. A Dunhill-Namiki catalogue from 昭和10 (1935). 66508 Yen (508 Euro / 626 USD) was also the price at the end of the auction. Now, this is a good price for 14 old pages of paper. Someone really spent a lot of money to get this catalogue. Speculations are already under way, who was that buyer. Personally, I would prefer the red pen on the cover page instead. But, search your attics. You might find the catalogue which pays your next pen(s).