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Pictures.-----Is this a motor with the 9.9 / 15 HP powerhead adapted to the 25 HP lower unit ?---Pictures make this easy-------1987 comes to mind for that model.
Looking at the ignition coil i put it mid to late 90s? Give seaway marine a call they have the best books possibly ID with the serial number?
There is a commercial sticker on it but it does look like a standard 15 hp model.-------Looks to be a 94 / 95 model.