I have an opportunity to get some tubes that the seller claims are NOS NIB Mullards that are National Electronics labeled. Here is what is on the tubes; National Electronics 6CA7/EL34 Made in E. Germany They have a single halo getter. The logo looks something like a cross hairs with the top line being a "1" and dots horizontally across the middle ant through the right side of the circle There is a dimple on top. They are straight tubes the same size as the base, not big bottle. I can get the matched quad for $200.00 and everything is in perfect, like new condition. Please advise.