One pair of RCA labeled Siemens 6922 tubes with gold pins. Made in the Munich plant in 1964. Matching date codes of 1964-43, they have the "O" getter w/splatter shield below and grey electrostatic shield between plates. I bought these many years ago as NOS and never got around to using them. They are still in their original boxes and now I don't have anything that can use them. The one photo is of the numbers/symbols etched on the tubes. One big vendor has the Siemens early to mid 1960's 6922 second behind the Amperex "pinched waist". Says "airy highs, great detail, solid bass". I'll pay shipping in the US.