I read somewhere recently that GE had plans to start producing tubes in the USA again sometime. Not sure if that mssg. was distorted through the grapevine and they will be rebranded 2nd/3rd world.
Historically I believe the Fender 763's came with grey plate 7025's in the 1st spots and RCA 12ax7(a)/12at7 down most of the time. The white lettered blackplate RCA's are from the 50's mostly and came in Tweed amps---though I forget the exact year they switched. I have seen a few blackplates with red lettering. You could find other high quality brands in a stock Fender from those era's for sure though. The RCA's are widely regarded as the best match for the original circuit ime. In the 70's it became more common to see GE's and eventually Sylvanias especially power tubes.
As Smolder said, 7025's are low noise rugged 12ax7a's best of the best. Sometimes they have contruction differences to help this. The only difference with 12ax7's from the a's is they cannot be used in a series circuit (or is it parallel ?) which is not applicable to Fender guitar amps. There are significant variations between tubes even of the same manufacturer and type brand new though. Sounds like you got some primo 7025's, nice. Were you comparing them with modern 12ax7'a?
woops...just noticed the date lol.