Turquoise frame, white bands on both seat tubes. Has J.C.Parkes on downtube, but no model name anywhere on frame. I understand that bikes (as opposed to tandems) have a serial number on left rear drop out, but nothing visible on this tandem. Metal badge on head tube with Parkes Lightweight Bicycles Birmingham on it. Have seen a copy of the 1938 Sun catalogue, and this model looks like the Sun Club Tandem, with drum brakes back and front, the rear brake being operated by normal brake lever for the front rider, and a foot pedal for the rear rider. Rear rider also has normal calliper brake on rear wheel.