These vintage porcelain capacitors are extremely rare. They go by a few names--Cherry, Argonne, Shield, and Herald. A boutique hand-made guitar amplifier that featured four Japanese porcelain caps in it recently sold for $1200 on eBay. 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 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. If you have any questions, please ask.
I have more capacitors and other vintage electronics listed--feel free to take a look!