You are bidding on a new old stock Western electric Type 310A radio/audio tube. It tests strong on my Amplitrex AT1000 tester at 107% of the specifications for emission, Em and 105% of the specifications for grid emission, Gm. So, it is a good strong usable tube. The date code is 7039. It came from a group of new Western Electric tubes recently found at a telephone company office. The original box is very poor. This the large punch variety of thi...s tube. It is guaranteed to be a good usable new tube that should sound great in your amp. Shippingweight is 12 ounces. Please see my other auctions for more interestingtubes, and radio and audio items.