Ohio Precious Metals (OPM) is the largest American refiner of "good delivery" gold and silver, offering a wide range of services to the precious metals industry since 1974.
The 1 Kilogram OPM Metals bars are made of .999 fine gold, the usual purity seen in the bullion market. The bars are also guaranteed to have a minimum weight of 1 Kg.
OPM gold bars bear a hallmark with weight and purity as well as a unique serial number.
The 1 kg bar is the standard size for investment gold. However, it does not provide the same liquidity as the 100g ingots.
1 ounce Gold Britannia (King Charles III) - Tube of 10 - 2023 - The Royal Mint
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