The Douglas Mark III is a British motorcycle designed and built by Douglas motorcycles in Bristol between 1948 and 1949. The 350 cc flat twin engine in the Douglas Mark III was based on a Second World War electricity generator. As well as the 1948-9 Douglas Mark III, Douglas also produced a Mark III « De Luxe », a Mark III Sports, and a rigid-framed motorcycle trials Competition version.
Source : Douglas - moto classique refroidie air (intervalles type)
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