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BSA engine crankcase with stamped serial number A65 LA 7386-Y

BSA engine crankcase with stamped serial number A65 LA 7386-Y

Close-up of a motorcycle engine crankcase showing the stamped serial number 'A65 LA 7386-Y' below the finned cylinder base, held by hex-head bolts. The metal is bare aluminum with darkened, oxidized finning above.

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