This is a relabeled Mullard tube made in April, 1966, 2nd week in the Blackburn Factory, England. You can see the serrated edge and guide pin hole typical of this era of Mullards and the code is visible and I have used a marker on each side of the Mullard code. The tube tests as new, which it is. Both halves of the tube test the same. New old stock and NIB. The tube has been tested and never used. Free priority shipping within the US. I have 1 left for sale at this time for $95 plus shipping. Why not get one of the best for your amp?