I'm considering a used 15HP Evinrude, and I forgot to jot down the Model No. when I looked at it. Can I tell the approximate year by the color? This one appears to be no more than 10 years old or so, and both the cowling and bottom of the motor are a medium blue color. I can't recall ever seeing an Evinrude with this exact color scheme, yet it doesn't look repainted. Thanks!