Up for sale here is this set of 3 used vintage Astron capacitors, dated 1961 and Made in USA. These are all marked 20 uf 525v, and test around 23, 24, and 26 uf, with a small amount of leakage. They will probably work fine at full voltage, though I don't know for sure. One of these has some staining on the paper case. Please see my pictures for details and test results.
US shipping and handling is $5, and international is $18, no matter what quantity you buy. All my small parts are set up for combined shipping--just use the "add to cart" feature, then check out at once to receive the combined shipping discount. If you have any questions, please ask.