Can't help with the name, but I am willing to bet that the gun is not S&W factory engraved. The quality and design are not the factory type and S&W engravers always leave an unengraved ring around the cylinder so that the cylinder stop would not mar the engraving. (Contrary to many engravers, factory engravers always figured they were making working guns pretty, not making working guns into show guns.)
Google turned up this:
http://site279.webhost4life.com/rafi...il.asp?Key=336
Jim