As mentioned, the 1802 variety S-241 posted shows 3 interesting and clear engraving errors on the reverse. It is an interesting type; however, the best known '3-errors' cent, and also a Red Book variety is actually 1801, S-219. S-219 shows an even more dramatic series of reverse errors than S-241: 'U' struck over inverted 'U' (making the result look like 'II'), Left stem on wreath WAS LEFT OUT, and a denominator which reads '1/000' instead of '1/100'. I only have a low grade example of S-219, but it shows all 3 errors clearly.
Bit of trivia about that 1802 rev. It was used to make the 1802 S-241 AFTER it was used to make the 1803 S-243.