Whoever knowingly purchases, attempts to purchase, solicits for purchase, mails, ships, imports, exports, produces blank certificates of receipt for, manufactures, sells, attempts to sell, advertises for sale, trades, barters, or exchanges for anything of value any decoration or medal authorized by Congress for the armed forces of the United States, or any of the service medals or badges awarded to the members of such forces, or the ribbon, button, or rosette of any such badge, decoration or medal, or any colorable imitation thereof, except when authorized under regulations made pursuant to law, shall be fined under this title or imprisoned not more than six months, or both.