If you have a matched "double halo getter" duet showing getter flashing in like condition, I'll trade you. I'll even accept dis-similar rebrands.
On the subject of "getter flashing" (the silver stuff deposited inside the glass envelope), I don't buy NOS valves from eBay, Reverb etc, but for anyone looking to, the getter flashing's condition can be a good indicator of how many hours use have accumulated on the tubes.
New tubes should show getter flashing like seen on the GE branded Mullards I posted a pic of earlier. Note the sharp edge of the flashing (& thin darkish band right at the edge of). Also a very solid silver colouring throughout the flashing.
By contrast, heres a pic of a couple of "used" Mullard xf3 (stapled plates) EL34's
View attachment 63759
These are currently for sale, expensively, on Reverb. Note the getter flashing (Barium) has been quite lessened through use, more so on the tube on the right. We could surmise that this is a "mix n match" duet, not pulls from the same piece of equipment (less hours on the tube on the left). Apologies for the derail. Cheers