I have some original vox branded G12 speakers from the 60s in blue and silver... I usually don't use them because of their extreme value, increasing rarity and the very real danger of frying them at stage volume... but they sound great when I jack them into my '62 AC30... I'm just scared I'll blow them up the whole time I'm recording. I can't hear a difference between vox branded blue and silvers although I believe marshall branded silvers are sometimes a different cone with a darker sound. Reconed blues and silvers are a joke… the big difference between these and the reissues is the paper in the cone. if your cones are shot you might as well save 500 or 600 bucks andhave a reissue. Ironically there is no such thing as a UK Vox bulldog speaker, blue or otherwise. Vox bulldog speakers were made in the USA by Utah speakers for Thomas Organ's line of solid state Vox amps. They have a big alnico cylinder but otherwise have American cones and hot-dog type baskets sprayed gold, not blue or silver. There's a big bulldog sticker on the back of the bell cover. When people talk about vox speakers they mean the celestion G12 though.