1966 Horn Button Question

[Cpa55]

I have seen pictures of 1966 trucks with both horn buttons. Mine appears on pictures of C10 Customs, however mine doesn't have the chrome trim on the top pillars with the word custom on it. So i appear to have a basic C10 with a custom steering wheel and horn button. I saw a picture of one just like mine, basic heater, basic instrument cluster, 3 on the tree, etc. with the same steering wheel and horn and the custom chrome on the top pillar. Does anyone else have the same setup as mine or is mine a "Heinz 57"? BTW, mine is an original black truck, if that matters. Thank you all so much for your help.