I picked up a set of these things that are technical markers, something like the Pigma Micron pens, but refillable. The PG5-1A set includes five markers in different tip sizes, a mottle of ink, spare fiber tips in each size, and adapters for use with a drafting compass. Does anyone know anything about the history of these pens? So far I've found nothing but a few eBay listings.
The Tombow USA Web site shows "American Tombow" in California from 1983 and moved to Georgia in 1992, so at least I have a time window. Tombow could only tell me that the line had been discontinued more than ten years ago, and sent an image of the last incarnation of the pens.
-- Edited by Chthulhu on Tuesday 24th of September 2013 04:15:25 PM
Five pens, five containers of replacement tips, three adapters for use with drafting compasses, and a bottle of ink.
See the ridges at the top of the cap?
A tug, and there's a hex wrench exposed ...
... that fits the tip "adjuster."
And all the main bits. The bottom barrel plug contains another little packet of extra tips. All in pretty good shape for a set that's at least twenty years old! Water-based ink, so I'm in hopes that these will soak or sonicate clean.
Tombows are certainly not mainstream pens. I own an Object black BP (with Zebra 301 bp refill now) and a Zoom 505 chrome rollerball I appropriated from the Missus. I found the same Google history info you did, but nothing more to help, I'm afraid. Someone who works in the drafting field might have some more useful info for you. Your set is in good condition, it looks.
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Although I couldn't make it fit, I knew I'd have to try. Now I'm telling all of you, I will never buy....