The first entry is always the pin's source. Overall confidence is a weighted average of how firmly each reference supports the start and end times used above; a reference counts half as much for every 180 days older than the newest.
BMW Group's[3] own Plant Berlin history page and its BMW Classic blog both state the first Berlin-built motorcycle, an R 60/2, rolled off the line on September 6, 1966.
Wikipedia's R60/2 article describes the "600 cc boxer-twin" (R60/2 1960-1969, 30 hp), its sidecar-oriented duplex frame, Earles fork, oil-bath shaft drive, 72 x 73 mm bore/stroke, 90 mph top speed, 17 L tank and 430 lb wet weight.
BMW Classic's own blog corroborates that final assembly of motorcycles moved to Berlin on 6 September 1966, with engines still supplied from Munich at that point.[1]
BMW's official Plant Berlin history timeline states: "The first BMW motorcycle built in Berlin - a BMW R 60/2 with swinging fork chassis - rolls off the newly build assembly line on September 6" (1966).[1]
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