Well, I can tell you that they aren't from any chevy truck from 47' to 54' don't know about other years....
Look like the ones that were on my '64 Chevy 1/2 ton. I didn't buy it new but from a friend's dad that did. I never saw any different caps on it the whole time he owned it. Frank
Aftermarket, maybe. Notice the bowtie bends, so it is not exactly like the Chevy logo. Aftermarket companies used to use look-alike logos to avoid copyright infringement.
3734031 is the GM part number, fits 57-60 chevy half ton pickups. Unless it's the bigger one that fits 3/4 ton trucks...hard to say without measurements
the aftermarket caps just had a dash rather than the bowtie. seen some 40 ford deluxe hubcaps that said "the deluxe" on them once.