Hello all, I have recently acquired a vintage Evinrude and am having some difficulty identifying this one. From what I have been able to figure so far is that it is a twin, it has an ID tag that has 1N580 on it, if I understand the tables that are out there, is this a 2.5 hp twin from 1923-1928? Here are some pics as well to help ID it as well. Thanks for any and all info.