Maker: Eclipse
Another example of the sort of inexpensive pen Eclipse in its Canadian form was best known for. This is a later example, given the sort of plastic it’s made from.
Production Run: c. 1940 – c. 1960; a very approximate range, as there is little to be found on the matter. If you have a catalogue or price-list with any sense of actual dates on it, I’d be delighted to hear from you.
Size: 13.4 cm long capped, 15.5 cm posted, 12.1 cm uncapped.
Point: Plated steel.
Body: Polystyrene.
Filler: Button, capacity approximately 0.7 ml.
One of the things I find endearing about it is the all-transparent body. One might call it a "demonstrator", although by what I expect is the time of this pen, no one was particularly dazzled by a button filler. Still, it is kind of interesting to see how the short press of the button leads to a full compression of the sac... if you're strange like me.
If you are relying on the preceding information to win a bet or impress a teacher, you should read the site’s scholarly caveat. Remember, this is the internet, and it’s full of bad information.