Up for sale here is this set of 7 used vintage Astron capacitors, Made in USA and with matching 1961 date codes. These are all marked 20 uf 525v, and test around 22-31 uf, with a small amount of leakage. They may work at full voltage, but I don't know. I would recommend restuffing them. These have some staining, and a few have a bit of damage to the paper as well. These were removed from a 1961 Fender Concert. Please see my pictures for details and test results.
US shipping and handling is $8, and international is $36. If you have any questions, please ask.
I have more capacitors and other vintage electronics listed--feel free to take a look!