Dave,
I don't have too many details. I had started to collect the cartridge knives a couple of years ago. The ones I started with had a CCC stamp. It wasn't until this one arrived that I realized it was from an earlier series ans stamped c-4 instead of ccc4.
I found this, but do not know more:
Camillus made a series in the late 1980s and early 1990s they called the "cartridge series," jumping off from their successful "classic cartridge series." The "cartridge series" knives sported a cartridge in the delrin handles and were identified as C1 through C6. This one is the C4 model called "camp/utility" and is 3 5/8 inches long when closed. It has a 1 3/4 inch coping, 1 1/2 inch spear, a wood saw, cap lifter, and screwdrivers. It was made in the USA of 440 stainless.
Ed T