UNC 10c Wrong (Small) Planchet ERROR COIN Ten Cent New Zealand NZ Undated RARE

An extremely rare error coin! It is unknown what planchet was struck with the 10c dies, or what year (the year is not showing). The coin weight 2.87 grams and is 20.4mm in diameter. Rarely seen error coin! A must have for any error coin collector!

It has been demoted as UNC on the 2x2 - this grade appears accurate, but please grade for yourself. No noticeable issues with it.