You lucky rascal!! That's a High Standard rebadged for Sears!!
There were 4 versions, check your gun carefully for a number xxx.xxxx like that...probably 583.3400, 3401, 3402 or 3403.
Let us know which one you have!!
Clean it well, and enjoy!! They tend to be more precise than the shooter behind 'em!!
I'm not just Trigger Happy, I'm Trigger Ecstatic!!