Johann Attenberger & Josef Schillinger, Dutch TT, Both killed 7 Jul Spa, sidecar Grand Prix de Belgique. The team had won the Dutch TT at Assen just one week earlier, and were leading the World Sidecar Championship.
A photo taken at the TT races in Assen in 1929, depicting three Dutch participants: Creemers on a Norton, de Kleyn on Sarolea and Broers on a New Hudson. Creemers' Norton may be a Moore-engined CS1 or perhaps an ES2. It doesn't look like a racer with the primary chain cover with an extension for the dynamo chain.
BMW RS 500 Rennsport Knijnenburg 1949 Assen Dutch TT motorcycle racing photo