I have had one for a number of years. As I understand it, C.A.W. stands for Colorado Auto Works. Colorado Auto Works was trucking company that ran a fleet of trucks for years in Denver. All of the trucks were powered by 235 engines with noisy valves, and when the trucks left the warehouse in the mornings, the local families complained so much about the noisy valve trains on the truck engines in the cold weather months that the owner of the company had valve covers cast for his fleet of trucks. Supposedly, covers were installed on the fleet of trucks in hopes the solid lifter valves on the trucks would more quiet. How many trucks there were, I don't know, but it must have been a lot because these things have been around for a lot of years. I have a neighbor here where I live now who lived in Denver for years and he told he never heard of the company. He tells me that part of Denver is no long the type of area for a trucking company.
A cover in good condition will polish up nicely and even though they aren't well "decorated" with fins, they still look nice. Most collectors of the valve covers made for 216-235-261 engines do include this cover in their collection.
Just my thoughts here: With your initials being C.A.W., how could you pass that up? For you, a cover in nice condition ready for polish, the prices seem reasonable. And your in Denver to boot!! Seems like a nice touch to a Stovebolt with it's home in Denver!