Re: Sears 7 HP serial/model/chassis number?
All of the 7hp Sears outboards were made by Eska. From about '69 to about '74.
Look for a number on the engine/powerhead. There could be a metal tag somewhere. If you can provide the Tecumseh engine number, I can tell you the year it was made. Any numbers you can find will help.
The biggest drawback for the 7hp models is that they used a special fuel connector for the external fuel tank. No longer available, I believe.