Actually the difference is mostly in a space between the A and M of AMERICA, and is a normal cent reverse, it was just used in the wrong years. The important thing to note is the proper years for each of the reverses, then you can go in your change, grab a couple of examples and a loupe, and look for the differences.
The " Wide AM" reverse has a gap between the A and M of AMERICA. It is supposed to be on all cents up to an including 1992.
The " Close AM" design started in 1993. The A and M of AMERICA touch on this reverse version.
The oddities discovered to date are:
1992 - Close AM
1992D - Close AM
1998 - Wide AM
1999 - Wide AM
2000 - Wide AM
The proof cents are a different story entirely. ALL cent proofs from 1988 to date are supposed to have the same ( Wide AM) reverse with the sole exception of 1993, which is supposed to have the Close AM reverse. To date there have been two proof cent issues discovered where in rare cases the wrong reverse was used. They are 1998S and 1999S. The INCORRECT reverse for these two years would be the same reverse that's supposed to be on the business strike coins for those years.
A bit confusing at first, these things should be easy to spot with a little experience looking at them. Again, my best suggestion is to grab any 1990, 1991, or 1992 cent and compare the details of the reverse with any cent minted after 1992. The specific details that are different are:
1. The obvious, the A and M are separated on the Wide AM while they touch on the Close AM.
2. The designer's initials are closer to the right base of the memorial on the Wide AM.
3. The G of the initials has a crosslet running across the center on the Close AM. This crosslet is absent on the Wide AM.
4. The A of STATES is equidistant from the two Ts on the Wide AM. The same letter is closer to the second T on the Close AM coins.
Have fun!
The " Wide AM" reverse has a gap between the A and M of AMERICA. It is supposed to be on all cents up to an including 1992.
The " Close AM" design started in 1993. The A and M of AMERICA touch on this reverse version.
The oddities discovered to date are:
1992 - Close AM
1992D - Close AM
1998 - Wide AM
1999 - Wide AM
2000 - Wide AM
The proof cents are a different story entirely. ALL cent proofs from 1988 to date are supposed to have the same ( Wide AM) reverse with the sole exception of 1993, which is supposed to have the Close AM reverse. To date there have been two proof cent issues discovered where in rare cases the wrong reverse was used. They are 1998S and 1999S. The INCORRECT reverse for these two years would be the same reverse that's supposed to be on the business strike coins for those years.
A bit confusing at first, these things should be easy to spot with a little experience looking at them. Again, my best suggestion is to grab any 1990, 1991, or 1992 cent and compare the details of the reverse with any cent minted after 1992. The specific details that are different are:
1. The obvious, the A and M are separated on the Wide AM while they touch on the Close AM.
2. The designer's initials are closer to the right base of the memorial on the Wide AM.
3. The G of the initials has a crosslet running across the center on the Close AM. This crosslet is absent on the Wide AM.
4. The A of STATES is equidistant from the two Ts on the Wide AM. The same letter is closer to the second T on the Close AM coins.
Have fun!



















