Many Radio Shack tubes are likewise from the 'desirable' factories. One of the interesting 'blind shot' tubes were the ones with the heavy RCA red label, that could be telefunkens, mullards, amperex, siemens etc. Westinghouse on one and Ken Rad on the other, with identical anatomy. It is not unusual to see a 'matched' pair on ebay with different labels i.e. Yes, a lot of tubes in the day were extremely incestuous in labeling and parts. They had been advertised as NOS at a pretty penny and looked very nice. I found the other one in my tube stash recently, tested it, and only one triode half was operational. One of them blew out in a couple of days. I bought a pair of triple mica 'forever' Siemens a while ago, hoping they would be plug 'n forget in my Wavacs. You can get duds from any tube, even the exalted ones. The matsushita dual triodes that 'flash' tend to be the ones that are mullard based.
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