Never seen these before - I'm guessing the parallelogram motion means the lever remain square to the bars when pulled? GLWS - bit different and would look great with a repaint.
great levers.. was fitted on my 96` hooger booger, (scott subbrand, i think)
later sold them, when upgrading to v-`s..
turned up for a bargain a few years ago... never letting them go now
silver grip, black bar fit.. will post pic if needed