Ordinary Japanese pens of the fifties and sixties are not well covered either in the various pen books I have or on the web. Searching for Pilots, I found plenty of references to the Capless/Vanishing Point, the Myu and the Murex but little else.
The seller described this pen as the Pilot Super 150V. I believe it was made from 1956 on. Some were made in the Pilot plant in Brazil. I don’t know whether this pen was made there but the inscription on the nib says that it was made in Japan.
Looking at this pen, I see hints of other things. The barrel shape and end remind me of the Parker 61 and the nib is like the “fingernail” nibs that Sheaffer made around that time. The anodised cap looks like those on Pilot’s long-shorts. I think these resemblances are no more than Pilot following the fountain pen fashions of the time.
I like fine and extra-fine nibs and that is where Japanese pens, Pilot especially, really shine. This pen is an EF and a particularly good one. It’s a cartridge/converter filler and unlike some other companies, Pilot has never changed the style of its carts so the present day Pilot cartridges and converters fit.
I think it is the very unfamiliarity of the older Japanese pens that appeals to me. I have occasionally had prewar Japanese pens, ink-in-the-barrel pens with a shut-off valve and sometimes exceptionally flexible steel nibs. After the war, as illustrated by this pen, Japanese manufacturers quickly caught up with more modern styles and filling systems.