These red plastic pouches (priced at 50 cents each) were issued by Singapore Mint from 1972 to 1983 to hold almost all those years (except 1975 and 1977 ASEAN) of $10 silver and nickel crown-size UNC coins.
If you don't keep these pouches well and clean them regularly, they become moldy and oily, covered with fungal growth.
Many coin collectors and dealers had thrown their pouches away.
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