Factory Steel Wheel Stamps?

[Patch]

So....the steel wheels with nubs I am picking up with my disc brake set-up from a donor 72 C10 are 5 lug. The rims are painted almost a burgundy to red color. I could only assume they are 5x5 BP being that they are indeed bolted up to the Chevy disc brake rotors. That being said, are there factory stamps on these wheels to identify them more clearly? I'll know more after Saturday when I pick them up, but was just curious.....Thanks.