Just aquired this one yesterday. I added a Williams rear aperature sight last night. This particular Benjamin rifle went into production in 1991 starting with serial no. 108XXX. It has slightly longer barrel than my 1975 Sheridan and a sliding rear safety,plus the forestock and trigger guard is different shape. The 'metal' on this rifle is in great shape,..only the stock has some small dings,scratches..More on these rifles here:http://ujays.net/sc9series.html
This link details evolution of the Sheridan rifles:http://ujays.net/sevolution.html
Rain permiting,hope to sight this rifle in today and get it on the chrono..