Go to this page there is a photo you can zoom that will show you the serial number from one that is for sale at Rock Island Auction. Ruger M77 Serial Number Here is the whole database to search if you want to view others. Gun Auction Database
There is very limited information on these revolvers, and the serial number you posted does not track with what information I have. The true serial number on many of these is stamped on the inside of the top of the frame, and the cylinder must be removed to read it.