Shimano LB-100 Down Tube Clamp On Gear Shifter Levers. These early Shimano shifters are also known as the "ALMI Lever". They were used with various groupsets from the mid-70s onwards. As these are friction (non-indexed) shifters they will work with any make and speed of rear derailleur.

In good condition, with some rust spots in places - please see all photos for details.