Unpunched center hole

This highly sought-after type of error is generated by the failure to shear the outer ring intended for the production of bimetallic coins.
In these cases, the planchet escapes the drilling operation and ends up in the basket together with the correctly perforated center hole.

Italian Republic - 500 Lire 1988 R Quirinale
O/ and R/ Unpunched center hole. Weight 6.4 gr. Diameter 25.8 mm. Palazzari collection

This type of coins, over the years have been classified as artifact coins. Although it is probable that the coins in question may have been produced on purpose by the operators assigned to the hydraulic press, these monometallic coins were also found inside the rolls packed inside the mint.

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