For sale in the original box one new old stock12AT7 RCA Seeburg vacuum tube. 

Anyone with a tube amplifier this an excellent choice, RCA made some great tubes in this era.  

Manufactured by RCA for Seeburg in USA

    Date code.                    Test result TV-7D/U

1. 6430 July       1964        72/72

2. 6342 October 1963.       78/75

 Green graphics on tube are good and readable.