Of Eberhard Faber’s colored pencils the Mongol line is probably best known, but these are some of the lesser-seen Van Dyke colored pencils:

And while Mongol pencils were designed so that they could blend by using water and a brush (e.g. “Paint With Pencils”), Van Dyke colored pencils were touted as being “weatherproof”.

The cardboard case folds out and can be used like an easel:

Eberhard Faber had a separate line of “waterproof” pencils but I’m not certain whether they came first, or if they were a spin-off from the Van Dyke line. I get the impression that these pencils might have been marketed more to engineers and the like rather than to artists.

I think this set dates back to the ’40s. Since the endcaps are those associated with Mongol pencils (i.e. black with a middle band of gold), I wonder if they were produced long enough to have gotten one with a different design.