This is a very good VINTAGE SYLVANIA 12AT7 TUBE. Vacuum Tube Sencore Tested  GREY TRIPPLE Plates,  - D - Getter.  It tested strong on my newly calibrated Sencore TC-162 tube tester and both tubes sections seem to be in the good 100 % + range with no shorts or grid leaks. This has some lettering worn off from box rubbing.  This would be nice for a new project or replacement tube in another. Please look at the pictures for the condition. I am selling all my tubes and parts. JN-21