I was looking to purchase the aforesaid model. However there appear to be two variations, namely related to the the "screws" inserted in the 'Wood' grips: 1.) One variation displays Brass and 2.) Displays Black Galvanized. Which is the original (correct) per manufacturer? Secondarily, how can one determine the year by the serial number, basically the new models. For instance: AB150688 . All replies are very much appreciated.