Pair of used but good contion Dräger Divers Sandals: see photo's. These are made by Dräger in Lübeck since the 1920's. I use such sandals myself when diving 'hard-hat;' or with the Denayrouze Regulator back-pack. They are heavy enough but no to heavy. Price €100,- plus shipping.
Pair of Dräger Divers Sandals