smith and wesson 4x18x42 scope

[hairy perch]

I bought a S&W scope some time ago and was wondering what the value of this scope is. The only markings on the scope are the S&W logo on the side and on the objective? lense it has markings from 50 yds to infinity. the serial number is 0001600 and marked SWR418x42. Any help would be greatly appreciated