What is a his and her stick shift in old muscle cars?

A "his and hers" shifter (also known as a Hurst Dual Gate shifter) is a special type of gearshift lever used in some high-performance "muscle cars" of the 1960s.

It consisted of dual shifters in a single housing that allowed the driver to quickly select either a low range (for drag racing) or a high range.

For street cruising where high top speeds on open highways were desired. Shifting was usually accomplished by raising or lowering the entire assembly or pushing it left or right, depending on the design.