Have a look here and compare the pictures, maybe you will find something that looks like Phillips aka Mullard.
http://www.tube-classics.de/TC/Tubes/Valvo EZ80-81/EZ80-81.htm
You have to be careful with the rectifiers as there are many variations of well-known manufacturers or all were Brander.
Tronix,Ultron ect could all be Mullard,Rft and so on.
So save your $ for well known brands where you can get them for half the price or less.
Ez80 Bel for example is a Mullard that was made in India with Mullard moulds.
Hunt rather really that of Nec,Sylvania,Rca and so on.
Anything that may have been around for a short time or is rare to find are actually top end rectifiers.
The EZ81 Nec for example is a very good one if you can find it at a good price.
I just got the Sylvania EZ81 in and it's just playing in.