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The 4WF69B model, 4hp Johnson, would be a 1969 year model.
b 08800420
It is a 1980 to 1990 Japanese built Mariner. Look on http:/www.marinshopen.se/index.htm
To find out how old a 4HP Mercury outboard is, you can look at the label on the transom bracket, where you will see a two digit number giving you the year it was built.
Try this site - http://www.marineengine.com/mfr/mariner_outboard.html
You may have mistaken the '1' for a '2'..if your engine is a 4hp 2 cylinder it dates from 1978.
1969
1969.
The 72 in the model number stands for 1972, the W stands for weedless, and the S means it's short shaft.
Sea horse 4 hp, the 74 states it's a 1974 model. Similar parts reference can be found at boats.net, they list a 4r74r,
Johnson 4hp outboard bj4brcud
part before hyphen is model number for 1969 4 hp.