This auction is for one original boxed Mullard 10M Master Series type 12AT7 dual triode tube-  also known as ECC81.  This one looks to be NOS and checks excellent on Hickok type 6000A tester with triodes reading closely to each other.. Nice printing on tube .Number printed on tube looks like 1022-219 -  Box in nice shape also but foam inside is crumbling.  Great tube for audio use-  will ship worldwide.