Three Western Electric 2C51/396A twin triode vacuum tubes-new old stock in box - all same date code of 3-50 (013 on tube). One tests 6308/5928 uMhos, one 5624/5396 uMhos and one tests 5016/5842 uMhos with baseline acceptable of 3800 uMhos per section. Tested on Hickok AN/USM-118B tube tester. See pictures for condition of box flaps.