وإن لم تتعين
Translation: Even without identifying particular individual coins.
Circulating fulus function as currency. A buyer owes the agreed quantity of accepted coins, not necessarily those particular physical pieces held when the contract was made. If selected pieces are lost, equivalent circulating coins can normally discharge the price.
This distinguishes identifying the actual specimens from knowing the amount owed, which must still be determined.
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Why particular circulating coins need not be identified
Bab al-Sarf: Circulating Fulus, Obsolete Coins and Money-Changer Exchanges
وإن لم تتعين
Translation: Even without identifying particular individual coins.
Circulating fulus function as currency. A buyer owes the agreed quantity of accepted coins, not necessarily those particular physical pieces held when the contract was made. If selected pieces are lost, equivalent circulating coins can normally discharge the price.
This distinguishes identifying the actual specimens from knowing the amount owed, which must still be determined.