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A 110 hp Mercury outboard, serial number 2018401 is a 1966 year model.
The 110 model, 9.8 hp Mercury outboard, serial number 1864795 would be a 1965 year model.
A Mercury model 110, 9.8 hp outboard, serial number 1471875, would be a 1963 year model.
1963.
A 9.8 hp Mercury, serial number 7209676, would be a 1984 year model.
How old is my Mercury 110 9.8 hp serial no 4814215
Mercury 110 s seem to have only been made in 1966 and 1967
A 9.8hp Mercury outboard, serial number 2143520 would be a 1967 year model.
63
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The 9.8 hp Mercury, was produced from 1963, serial number 1474328, to 1985, serial number 6620196. In 1986, the 9.8 was discontinued, and the 9.9 went into production starting with serial number A197384. I have searched every 9.8hp Mercury model year chart that I have, searching Canadian models as well, and cannot find serial number 9197923 listed. I could only hazard a guess and say a 1985 year model. If anyone knows for certain, I am curious to know.
Your mercury 110 engine falls within the engine number range 3795658 to 4691221. So your number is 4305943 and is roughly half way, so I would guess it is 1975 as the range is 1974 to 1976.