Swine seizes two keys and two notes, money used abroad once (7)

I believe the answer is:

pfennig

(Other definitions for pfennig that I've seen before include "old rhino" , "Hundredth of an old Deutschmark" , "Former German currency unit" , "Approximately two point two zero five pounds" , "One / One-hundredth of a Deutschmark" .)

I've seen this clue in The Times.

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