Accepted USD Banknote Formats in Mauritius: what actually matters to know
Short answer
Currency exchange points and airport kiosks in Mauritius frequently reject old-series USD banknotes, so it is best to carry the latest issue bills with the blue security strip. If you have older notes, banks such as MCB and SBM generally accept them at standard rates without extra commission.
From real experience
Old series USD banknotes are often rejected at Mauritius airport currency exchanges.
Recommended banks for exchanging older USD bills: MCB (Mauritius Commercial Bank) and SBM (State Bank of Mauritius). Specifically, a bank near the bus stop opposite the Grand Baie public beach is reported to accept older series notes.
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Currency exchange in Mauritius: Banks (specifically MCB) accept old-series USD bills at the same rate as new ones without extra commission.
UAE Dirhams (AED) are also widely exchangeable for Mauritian Rupees (MUR) at major shopping centers like Casela.
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Airport currency exchange kiosks are available but rates are generally lower than in city centers.
Recommended local service: Shibani Exchange. Note: USD banknotes must be the latest issue (with blue security strip) to be accepted.
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Old-format US dollar bills may not be accepted everywhere in Mauritius.
While some exchange points in the airport might accept them, it's advisable to use newer bills. MCB bank exchanges any currency without commission.