Dia-Compe ENE Down Tube Shifters
The Dia-Compe ENE shifters are some of the best shifters of all time. These are so smooth because the ratchet equalizes upshift and downshift effort so perfectly that they will satisfy even the most demanding randonneur. These shifters are made by Dia-Compe so the quality is first rate.
They work with 5-speed to 10-speed cassettes and freewheels and most common derailleurs. (Note: most SRAM derailleurs don't work with non-SRAM shifters.)
Sold as a left and right set.
These shifters are absolutely gorgeous, and are a breeze to install. They work as they should. The ratcheting is nice, and the return is smooth. My only gripe is that the right shifter has a bit of lateral play. The left shifter doesn't have this play, so you may not experience the same issue. It's not a huge deal, but doesn't feel as "solid" as it could. That said, they work perfectly, so I wouldn't hesitate to buy these if you're interested.