The decals changed on a yearly basis. Colors changed a lot as well. Describe it. Also, look for numbers on a silver disc somewhere on the crankcase under the hood.
A little survey of iboats finds: <br />E3613138 '72<br />e3612273 Yours<br />E3600351 '72<br />The lighter green colour was used '72-'76 so that's consistant. '71 and earlier had a very dark green. <br />Aha! here's a pic of a '72 25hp:<br /> Click here.<br />Hope this helps!