By the little I know on tubes I have never seen a such tall plate in 12AU7,
imo looks as a cheap JJ ECC802S plate, the JJ and EH ecc802 have both short plates.https://www.tubedepot.com/products/jj-ecc802s-hi-performance-12au7-gold-pin-preamp-vacuum-tube
The posted photos above show a fantastique new
tube paint labels,
very new, just like factory released, there are various labels and all
are new, the paint looks brand new, not a 50 years old paint.
To my eyes the top glass shape, getter and the top tip looks as a JJ ECC802S
tall plate current production not a expensive NOS RCA.