1962-1963 GMC K1500 hubcap

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Interesting thread.
Makes me curious about the history of my 65 K10. I’m the second owner, but unfortunately the original owner had been dead for many years before I got it (long story) so could not ask all the questions I would have loved to ask. It originally came from the local Chevy dealer and spent its entire life before I got it on a local horse ranch. My buddy that used to manage the farm supply store remembers the ranch manager using the truck to pick up supplies in the old days.The truck had been parked in the barn since the 80’s. When I rescued it it still had what due to paint and condition looked to be the original 15” clip type split rims. The original built sheet behind the seat lists the wheels as HB5, and they were originally painted white. What is interesting is it still had some very well used small hole 60-63 Chevy painted hubcaps on the front only. I know Chevy didn’t put caps on that year 4x4, so maybe the dealer dug some up to doll up the truck in the showroom, but interesting that the factory would have installed clip type rims on a K truck that would not have been offered with caps. I know the rancher would not have gone out of his way to find hubcaps for a work truck for the ranch hands. What’s amazing is that they were still on the truck 20 years later when it was parked. The build sheet shows the Spicer hub option, but unfortunately there is a big hole where some other options are listed (damn mice).

Any ideas on how this truck wound up with what sure look like original hubcaps?