question about vintage 4-colour pencil

I have a vintage 4-colour pencil of unknown make. It carries no stamp,
though I guess that might have been on the cap that is missing.

The sliders do not lock into place. They are held in place solely by
friction, which can be altered by adjusting the brass screws on the
sides of the case.

http://www.box.net/shared/static/b8pxhv1hnq.JPG

The leads are approx 1.5 mm diam. and are held in springs forced onto
the tips of the sliders.

http://www.box.net/shared/static/fas9zirs7m.JPG

I am familiar with the Norma and Majus 4-colour pencils, but this one
uses its own technique for offering the four colours and mounting the
leads.

Do any of you have any idea who manufactured this type of pencil, and
when?