Bas ! Great photo !!
And Stephen…yeah…you have to use 1 lever to unlock the rear axle, then you use the other to lift and move the chain to a different cog ( 3 speed ) …then slightly back pedal to take up slack, then lock the axle back down…. Gino Bartali was super good at it. …me ?..I’m still afraid of losing fingers ! But it is a super interesting piece of history that I was glad to find and save !