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6R72D 6 = 6 horse power R = rope 72 = 1972 D = ??
1961
i have a johnson seahorse outboard 20 hp motor model 20 ba serial number 26711 would like to know the year it is.
1946
It is a 1957
The 77 in the model number 10R77A means it was manufactured in 1977.
Your 1958 Johnson uses a 24 to 1 mixture.
1984
It is a 55 horse, Electric start, Long shaft, 1977, production D motor
1979
Looks like it would probably be 1960. http://www.marineengine.com/parts/john_model_guide_pre80.html
Built in 1982 according to several website. My sea-horse serial number is only about 100 serial numbers from yours... in the same batch.