Interesting mechanical pencil insert mounted on the large compass. Is that a cutout window in the side with clicky lead advance plunger?
One bit of advice - if that semicircular protractor is made of celluloid, I’d keep it separately from the metal instruments (that is, out of the box completely). Over time the celluloid releases acidic gases that will damage metallic surfaces.
Polyurethane foam can also be problematic in the longer term, as it eventually disintegrates into powder that can stick to the instruments. A couple of perils that pencil collectors don’t usually have to worry about, but are the bane of drawing instrument collectors’ lives.