Up for sale here is this vintage RCA 6SN7GTB tube, Made in the USA and dated 1957. This has clear glass, staggered black ladder plates, a nice patch of silvering, and a side wide D or horseshoe getter (it's hard to see).
I tested it on my calibrated B&K 747B tube tester, and it tested at 57/59, with no shorts or grid emissions, on a scale of 0-120, where 65 is minimum good and most 6SN7 tubes test in the 40-60 range. This is guaranteed to work great for you, and would sound fantastic in your vintage guitar amp or stereo. Please see my pictures for details.
US shipping and handling is $4, and international is $14, no matter what quantity you buy. All my small parts are set up for combined shipping, so just use the "add to cart" feature and then check out all at once, and it will combine shipping. I accept Paypal. If you have any questions, please ask.
I have many more tubes & sockets and other vintage electronics listed--feel free to take a look!