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It is possible RCA had a shortage and re-labeled another makers' tube or used Zenith type PVA. Peel the tape on the edge and poke the glue...If it is soft and springy like chewing gum when you first get it soft, then it is Zenith type glue (which was not used exclusively on Zenith tubes), but if it is hard as tire tread rubber then it is RCA type glue (which was not used exclusively by RCA). Neither Zenith nor RCA were the exclusive maker using that glue, and IIRC both makers used other types of glue occasionally (very rare to find).
I've also seen smaller makes use something in between or outside of the two types normally encountered and thought of as Being either RCA or Zenith....Those can be a bitch.
Regardless of make/label the yellow/green springy stuff is what we call Zenith type, and the hard stuff that turns white/black and moldy is RCA type. Ignore the makers mark and look at the glue!
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