With inflation above 100% larger bank notes have expiry dates
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Zimbabwe's government has criticised "mischievous political slogans" which have been turning up on banknotes across the country.
Cryptic messages have appeared stamped on the notes calling for an end to the government of President Robert Mugabe.
State media have published photographs of cash stamped with the captions "enough" and "get up, stand up".
The government says it is a crime to deface notes and warns culprits they will face "the full wrath of the law".
Deputy Finance Minister David Chapfika said that he thought the slogans had been put there by members of the opposition.
"We are still doing our investigations but the slogans appear to be synonymous with slogans used by certain characters in the opposition," the deputy minister told Reuters news agency.
Last year an underground group known as "Enough is Enough" said it was responsible for putting similar messages on packets of condoms.
They also quoted the late Bob Marley's popular protest song Get up, stand up for your rights.
He performed the song at Zimbabwe's independence celebrations in 1980.