I have a couple of GZ32 I got from a good UK dealer, marked "tested 100%" and in white box. One is Mullard and looks a little used but clearly tests as new. The other is just marked "made in england" but looks identical to the Mullard except from having a round getter instead of a rectangular - the other structures and sizes look the same. So "assumed to be Mullard" but not marked as such. That one is new unused. Looking for £38 the pair plus postage. Andy