Thank you for being here and we look forward to serving you! Vintage World Mint Corp. 999+ Fine Silver Vertical Bar – RARE. The Vintage 3 oz World Mint MFR (Metal Fabrication & Refining) silver bar is a stunning piece of bullion from the late 1970’s / early 80’s, composed of 0.999 fine silver. With a unique bar shape and a total precious metal content of 3 oz, this collectible item is a valuable addition to any investor’s portfolio. Made in the United States by the World Mint, this silver bar is a rare find for collectors of silver bullion. The MFR is “Metals, Fabrication & Refining, ” which is a designation. Would love to find out more about this mark, because it’s found on other World Mint ingots, too.