Here I have a nice 3x matching numbers basket-case 1953 BMW R51/3 , born April 10th, 1953 and delivered the same day to the german BMW dealer Betzl in Albaching. As you can see, the frame number, engine number and steering head data plate are all matching. A hard to find feature these days. But the matching numbers don't stop there. The engine case, and timing cover also have matching numbers! The Bing carburetors are matching too, 1/24/131 and 1/24/132. In the early post-war days, BMW stamped a 3 digit number into the block and front covers for some reason, possibly to match them for machining. The great news is that these 2 covers have stayed together all these years.
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