Plural of billfold; multiple small folded cases designed to carry paper money, cards, and identification.
Simple plural of 'billfold', adding '-s'. The product category expanded dramatically after the 1920s as paper currency became the dominant form of money and billfolds became universal accessories.
Billfolds became status symbols in the 20th century—leather quality, brand names, and craftsmanship mattered, and losing your billfold was genuinely catastrophic because it contained all your money and identity in one object!
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