L 20. What does it mean?

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I'm just curious if anybody might know why the left hand crankcase on my MK3 has L 20 stamped on it on the front edge, above the front isolastic mount and below the barrels?

There is no stamp on the right crankcase.
 
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May 19, 2006
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Dunno. Mine has H22 as do others that I've seen. It's not to do with matching the halves because those numbers are stamped low down on the rear.

Presumably a batch number or production date code ? My bike is from April 1975. Any clues there ?
 

L.A.B.

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My Mk III L/H case is also stamped H22, although the cases are factory replacements.
 
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