We have a few of these NOS National branded 6267/EF86 tubes, used in Neumann U67s. These do not have their original boxes.
We have an extensive list of about 3,000 tubes for sale, most of which are NOS (New Old Stock) and NIB (New In Box). Here is a link to access the list. If you highlight the link and right click it, you can open it. If you're interested in any tubes, call or email Dan, (but do not text, please!) for more information. +1-510-527-1411 or firstname.lastname@example.org
Will combine shipping.