One is labeled Mullard and the other is labeled Webcore. These are 1960's ribbed plates. They are well matched and test very strong at 1600/1600 and 1600/1575. It's hard to get a better electrical match than these and of course they're matched structurally. The Mullard-labeled tube has the original box as well. I can supply date code information and additional pictures if necessary. These were purchased only a month or two ago from a very respected tube dealer that I've bought many tubes from over the years. I went through a lot of tube rolling for a new amplifier recently and now I need to sell some off to finance the next purchase. I'm asking a very fair price. Well matched strong-testing pairs are going for $200 minimum.