I just saw BaySaintLouis' post and his coin with the missing last digit is a different situation. If you had his coin in hand, you should be able to tell if the digit wasn't struck up because of a filled die, usually dirt or grease. If there are tiny circular scratch-like marks in the area, a common cause of missing or slanted, or damaged last numbers was the old automatic roll wrapping machines the big banks used. One Lincoln cent that pops up on error forms is the "slanted last 1" found on a few 1941 cents. This is abuse after the coin was made inflicted by the old roll wrapping equipment. Then after the coin was in circulation for a several years, the affected area would get smoothed and blended together.
Phil
Phil