PCGS 1940-S wheat cent blowhole defective planchet, with a small blowhole in the central area of the coin. Held up to the light, the coin can be seen through. Scarce error type. AU55 Brown

PCGS 1979 Lincoln cent blowhole defective planchet, with a "hole" in the coin, and a crack/defective area as well. Scarce.   AU58 Red/Brown

PCGS 1970-D Lincoln cent blowhole defective planchet, with the coin having a hole that goes through the coin. Scarce error type. MS63 Brown

PCGS 1958-D Jefferson nickel blowhole defective planchet, and with a long defective area in the coin. The blowhole is small bus easily visible when tilted in the light.    XF40 

PCGS 1952-D Lincoln wheat cent struck on a silver dime planchet. The coin is struck on a silver dime planchet, and so is both the weight of a dime and also the metal of a dime. Some of the Lincoln's...