Serial number no model number

[Nonothing]

Hi
I am a first time second hand motor purchaser. I bought an old looking Evinrude 25 hPa motor for $350. My son and I are wanting to educate ourselves on motor maintenance. The name plate is missing but a plate that says : serial number A338846 has been stuck in its place. I have searched the netto see if this relates to model number or year or any other info but can't find anything. Does it relate to anything or not. How else am I able to find out details before we begin working on it. Any help would be much appreciated.
Regards
Nonothing

[Solarman]

On older models the model number is the way to identify what year it was made.

It might be possible to match a pic of the motor with Cowling on, to something similar, and get a closer idea of year model?

There might also be a small stamped circle (similar to a freeze plug on motors), that may have model info on it, on the motor somewhere?

Good luck.