I'm in the process of upgrading my single circuit master to a dual for the manual drums on my 65 442 4 speed. I ran across this under the hood today and was wondering if anyone new the era that these were used. It says "Hurst 3731" on the brass body. I know this car has some race history out of NY in the Seventies. I was just wondering when these were available?

Thanks,
Steve

 

Still wondering on this if anyone has any ideas?

 

Saw one of these on eBay sell for $300. I might need to find the original switch that came with them and reinstall into my 65 442. Still looking for any info on these.
Thanks Spo