Re: 1908? evenrude no ser#
What a great find!
I can tell you it is not quite as old as you think. Very few Evinrude rowboat motors were made in 1909, 1910 was likely the first year of commercial production. Yours has a skeg, and likely the Evinrude logo lettering on the exhaust manifold, unlike the early versions.
By pics alone, and the fact that you believe it to be a model A, it is no earlier than 1915 2.0 hp. The model B`s in 1915 were 3.5hp.
Look underneath the flywheel where the knob would be for the serial number stamp.
By the way, where did you find it, would love the story!