from left to right: Robert Grogg and Andreas Grabner (Switzerland), Sergey Shcherbinin and Boris Poganovsky (USSR).
Grogg/Grabner crew won the stage of the FIM Cup in sidecar motocross class. Shcherbinin/Poganovsky took 2nd place, riding Ural-900 motorcycle.
Denmark 1973
Photo by Chris Somers
source: Foto magazine MOTOR 1973, Andrey Spitsyn