Just picked up this Evinrude from a friend to do some maintenence (water pump, carb rebuild, etc)
However the identification plate is missing, so I need to know the year so I can order parts.
Here are some pictures:
I think you may be right,
I found a part number of 320819 on the motor
And with a quick search I found that part belongs to a 1978 9.9 model 10825m motor.