There is an example of a rare penny, I believe the 1862 halfpenny date, that exists as a split planchet.. Regrettably, I once sold a 1862 halfpenny, die letter A, that was also a clipped planchet. Errors involving rare dates or varieties are somewhat of a white elephant, and become difficult to place a value upon... Often, an error on a rare date or variety lessens the value as most collectors want a "more perfect" specimen for their collection. .