Mullard ECC33 = 6SN7 = B65 early production valve Tube Double Triode Good NOS

Mullard ECC33 = 6SN7 = B65 early production valve Tube Double Triode Good NOS? 1x Mullard ECC33 = 6SN7 = B65 possibly NOS as it came wrapped in mullard wrapping this item has been tested in equipment and is working.