Looking for model year: Model No. 917.25631; Ser. No.6950
Not sure if this is a Suburban, side of hood merely has the numeral 12.
thanks for any help

It's a 1971, 12HP Suburban.

Thank you spence. Follow up question. How do you identify whether engine is a B&S or Tecumseh? Manual and decal on engine show only Craftsman Engine. Shows "Solid State Ignition" and "Timken Bearings".
Engine Model No, 143.602022 but I believe that is just Craftsman's number.

That is a Tecumseh engine. The manufacturer source code of 143 gives it away. If it were a Briggs, it would be 500.

Here is just one internet listing of the source codes:

http://www.professional-power-tool-guide.com/Craftsman-Sears-Manufacturing-Source-Code.htm