Serial #515291 model # wg4
Do you know anything about the above model and serial number. I found a Wizard and it works. Thanks

You have the 1952 Mercury made Wizard super twin. It is 6 hp and the parts manual is uploaded in the forum. Just search wg-4 and also WG4 in the search box to get information from previous posts.
They are good motors.

Click here for the parts manual.

Thanks so much. Any idea on the value? It's in great shape.

At many AOMCI meets they sell for between $100 and $200. So much depend on what buyers are there on a given day. I suggest that you watch www.ebaymotors.com and see if you observe any in similar conditions.