What is the Value of a Ruger Super Black Hawk 44 Mag?

Up to 1000 USD or more depending on EXACTLY what you have.

what is USD?

Not sure what that is? I'm trying to get this information for insurance purpose

USD is the abbreviation for US Dollars. We get questions from several nations. Value will depends on condition. Suggest you check with a local firearms dealer to evaluate YOUR Ruger.