Hi,
If you are building a power supply intended for 2N3055's its often better to jump up to the 2N3773 (16A 140V). These, like the 3055, have been subject to cloning and many, even with vintage date codes and logos coming out the far east are not genuine old stock at all.
However, inside the USA there are companies that only hold old stock. If the moderators allow this link, this company (who sell products on ebay, consolidated electronics) have all genuine old stock, especially of Japanese transistors of which I have bought many from them. So if you went with these for your power supply, you could not go wrong:
https://www.ebay.com/itm/2N3773-Orig...8AAOSwAHBaFIbn