Johnson and Evinrude outboards, use the model number, rather
than the serial number, to determine the year model. Mercury
outboards, uses serial number and horsepower.
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Johnson outboards uses the model number, to determine the age of
the engine.
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Johnson 50hp outboards with model designation TLEDS were
manufactored in 1996.
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On Johnson outboards, the model number is used to determine the
year model of the engine.