I've recently bought a steel frame Ladyback tandem which looks similar to a Schauff. I have some photos of lug details which may help to identify it. The problem is that someone has repainted it and presumably overpainted any signage on the frame.
The primary and secondary chains are on the right hand side of the frame as viewed by the crew, the cranks have cotter pins and the rear cranks are considerably shorter than those for the pilot.
It seems to have been designed with fixed gears in mind as it has a chain tensioner.
A thank you would be appreciated for my reply (on your other thread) about the hub gears.
Co-founder of a V-CC section, member South Eastern Road Club and owner of - 2005 Bianchi Reparto Corse (modern), 1985 Raleigh SBDU Pro Super, 1984 Raleigh LU Corsa, 1980 Allin Stan Butler Special, 1978 Ron Cooper, 1975 Bill Philbrook tourer, 2 x very early Roberts (mid/late 1960s), 1966 Raleigh Superbe Roadster, 1964 Allin Stan Butler Special Belgique, 1951 Hobbs of Barbican S/C, 1950 Hobbs of Barbican S/C, 1947 Hetchins Super Special, 1908 Centaur Featherweight. 1988 Specialized Stumpjumper.