What year was Mercury Outboard motor #0G374065 manufactured?

Question edited for a lot more clarity.

They are normally listed by HP.

https://www.google.com/search?q=mercury+outboard+serial+number+lookup

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Question edited for a lot more clarity and correct spelling of the maker.

Owners Manuals - Mercury Marine

http://www.mercurymarine.com > land > owners-manuals
To easily access an Owner's Manual with consolidated information specific to your Mercury engine - agree to the terms and fill out the form below.

Mercury Outboard Service Manual Free Download PDF

https://www.downloadboatmanuals.com > motors > mer...

On this page you can free download more than 80+ operation, owner's, maintenance manual, service and repair manuals for Mercury outboard motors in PDF.

mercury 20 hp outboard manual for sale - eBay

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1997 Mercury 20 HP 2 Stroke Outboard Shop/Service Manual on DVD! Brand New ... Mercury 200 Outboard Motor Parts Manual - 20 HP - 1976 - 3537531 & up.

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Question edited for clarity.
Question moved from Computers.

Puzzled by the 'OR' serial number prefix

https://www.themanualstore.com/Mercury-Mariner-Outboard-Motor-Model-Year-Lookup-Guide-s/269.htm

This article says your engine is a 90hp! :>D

http://www.marineengine.com/boat-forum/showthread.php?431664-Mariner-30hp-what-year-is-it

https://www.google.com/search?q=mariner+30hp+year+of+manufacture

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Hey Robert,
What motor do you have?.. Size, year, two stroke/four stroke..etc.. and what shaft are you talking about?
Mercury Outboard Manuals by Seloc 1965 2014

need the year of manufacture as some 2 stroke units have oil injection that automatically mixes the oil in the correct ratio for engine rpms otherwise it is 50:1 ( 50 parts fuel to 1 part oil)
oil requirements --certified tc-w3 2 stroke outboard oil ---not ordinary engine oil
reference
google --type in mercury outboard oil to fuel ratio

QUESTION:
How can I determine when my outboard was built?
ANSWER:
Every Mercury outboard has a serial number label located on the transom bracket area of the engine. The latest serial number labels display a 2-digit number in a box at the lower right portion of the label. These digits coincide with the last two digits of the year in which the outboard was manufactured. For example, if an outboard was manufactured in 2010, the number "10" would appear in the box at the lower right portion of the label.

go google and type in--- mercury outboard serial numbers -- there are sites that listhp against serial numbers against year of manufacture
while you serial number may not be listed they state that the beginning of the number to the next changing number is the year of make
for example ---4261012 to 4302999 ( next number 48103665,year 2002) may be year 1999 so your number would be a 1999 model
The information provided will take a bit of understanding as it appears that the manufacturer changed the method a number of times
talk with a mercury / mariner service shop as they will have the information on hand

call mercury outboard they can tell you the answer to your question

Every Mercury outboard has a serial number label located on the transom bracket area of the engine. The latest serial number labels display a 2-digit number in a box at the lower right portion of the label. These digits coincide with the last two digits of the year in which the outboard was manufactured. For example, if an outboard was manufactured in 2010, the number "10" would appear in the box at the lower right portion of the label.

pinched rom another website:
Every Mercury outboard has a serial number label located on the transom bracket area of the engine. The latest serial number labels display a 2-digit number in a box at the lower right portion of the label. These digits coincide with the last two digits of the year in which the outboard was manufactured. For example, if an outboard was manufactured in 2010, the number "10" would appear in the box at the lower right portion of the label.