Hi! I bought this cab from a friend of mine few years ago. When bought the cab was already missing the front grill and had some bumps on it. After an incident involving microphone stand and my cab the element got busted and I havent used it since. I was nearly throwing th ecab away but then I happend to look it a litle closer and foun out it was a Marshall cabinet. Having a silver/grey tolex on it I immediatly thought it would be a silver jubilee model. I havent have any luck conforming that it indeed is a silver jubilee model so could someone help me with this? It says in the back that its model is 1515 and serial number is 1488. Is this a silver jubilee model? if not then what is it, being silver/grey and all? Do You think theres any point rewieving it to its former glory?