1939-40 Packard horn button.

There are two styles (see product pictures): 

HB01S – The horn button with four slots accepts a sheet metal embossed Packard crest.

HB01D – The other style uses a die cast Packard crest that has two legs that are screwed in from the back. 

When ordering, please specify the style and color needed. See color card in product photo gallery.