even in its home market , many of these are just sold as store brand or simply " Transparent Demonstrator Piston Filler fountain pen " with no particular model name, though check the specifics, the variation is intensely numerous, from hooded nib to Pilot style nibs to Lamy style nibs to the all encompassing No.5 , the section might be just plain circular or faceted / triangular , with or without trim ring. The piston might be locking or plain, the cap might be a screw in or snap on, then the cap might also include or not include an inner cap. And not to mention all the Color variation ( some time the whole pen, sometime just part of the pen ) ...
Anyway, I have very few interest in Demonstrator but I do got one of these, a no frill all circular ( including section ), no trim ring, no inner cap, screw on with a locking piston and a simple wire ( aka Lamy style ) clip and a oh so common Lamy style nib... what's I've found is since these OEM use ready parts , some of them might not fit all too well, so initially mine come with a transparent feed, it work just fine but I've found it somewhat less than snug fitted and could thus burp easily. I've swap in another similar black feed and it just fit way better and cure all issue ... so be prepared to experiment or some hand on with these, that stated, they are still great value. And I've hack mine with a Hero 58 two tone nib which write an Asian EF
Edited by Mech-for-i, 17 July 2018 - 12:32.