Hi - it would help to narrow it down more if we had some idea about the age of the jewelry. In the US during WWII Platinum was designated as a strategic metal and supplies were cut off from the jewelry trade. Jewelry that can be guaranteed as sourced from this period will have a considerable rarity value.
Maker's marks are not the ONLY criteria that determine value, the current value of the metal content and a view on the future direction of the price of the metal becomes and intrinsic factor in determining jewelries potential as an investment.
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