Up for sale here is this set of 2 NOS vintage Sprague 630D capacitors, dated 1977 and Made in USA. Each is marked 10 uf 25v and tests very close to that, with low leakage/ESR. These are guaranteed to work great for you. Please see my pictures for details and sample test results.
US shipping and handling is $5, and international is $18, no matter what quantity you buy. All of my small parts are set up for combined shipping--just use the "add to cart" feature and then check out at once, and the shipping will be automatically discounted. If you have any questions, please ask.
I have more capacitors and other vintage electronics listed--feel free to take a look!