If you want/need to replace it, I see new ones on ebay for less than 6$ shipped:yes:

 

Have you ruled out a loose connector?

 

The floor switches collect gunk and corrosion because of their location. Easy to plug and play a new switch, if yours is not too bad you can take it out and re-service it, clean it up lube it and put it back in service.

 

I had a similar problem with my '68. I replaced it with a new one from one of the popular online vendors. It's breeze to change out. I also replaced the headlight switch from the same source. (saved on shipping)

 

I had an old headlight dimmer switch that I took apart as I wondered how they worked inside. On this one there are three contact arms that connect to 6 terminals. The contactor rotates and makes different combinations of connections to turn on the low beams or turn on the high beams. On this one the rotating contactor has a spring on it to keep tension on the connections and this spring could wear out,the connection be poor, or have other issues. With readily available replacements, it's probably easier to swap one out.

https://www.flickr.com/photos/121766713@N04/albums/72157657367816900

Jim