Widest mouth - unstretched

According to Official Guinness Records,

The widest mouth measures 17 cm (6.69 in) and belongs to
Francisco Domingo Joaquim "Chiquinho" (Angola).It was measured on the set of Lo Show dei Record in Rome, Italy,
on 18 March 2010.

For a complete list of 2010 records, please visit 2010 Guinness Records in Italy.

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Other Italy records that might interest you:

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• Fastest time to flip 10 cars on the roof by a team of 3
• Most letters typed in alphabetical order with the feet in one minute
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