The rear dropouts on the Rensch are Super Champion and designed specifically for use with the Osgear. They were in the pre-war Constrictor catalogues. They are being used correctly - when a gear is used the wheels are mounted in the front section of the dropout - effectively a vertical dropout. If you wanted to use a hub gear or a fixed wheel, the axle was mounted in the standard type rear section so there was adjustment for the chain tension. Do you have the frame number - it would be very interesting to know as it is one of the earliest REnschs known...

Hilary Stone, Bristol, UK