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Bullion represents a form of precious metals, often gold and silver, that are traded on commodities markets and held as a store of value or for investment purposes. It is typically available in bars or coins and is valued based on its weight and purity rather than any numismatic or collectible value. While bullion itself does not include items such as stamps or collectibles, it shares a common thread with these categories through the concept of valuable commodities that are often collected and treasured for their rarity, historical significance, or intrinsic worth.