Horn or Horns

[Bargy1]

I have a 1965 C10 that I am closing in on finishing with a 7 year frame off restoration. When I got the truck it had two horns. One horn bolted to the top square tube of the radiator support and the other horn bolted to the sheetmetal below on the radiator support. The second horn that was bolted to the sheetmetal appeared to be scabbed in. My question is did these trucks come with two horns or one the second one added?

Thanks in advance for the help.