For a while I have been trying to understand the differences between a Conklin Duragraph and an early 1924 Endura hard rubber model and I have not been able to see the difference.
In the 1926 catalog, I can see more differentiation, because the Endura barrels are made of Pyroxilin in a variety of colors, however the shape and design appears to remain the same as the Duragraph model.
Below is Duragraph ad that I found online
And here is a picture of Endura pens extracted from the 1924 Conklin catalog.
They appear to me exactly the same from the outside.
Perhaps there is some differentiation in details I can't see such as inscriptions or other.
I would appreciate input on this issue.
Edited by sztainbok, 30 October 2019 - 14:36.