You and your lawyer should get the opportunity to see a copy of the license when you get the incident report. After that, you'll know if there might be any basis to your position that you confused a "7" for a "1" due to the wallet -- but be aware, part of your job in checking IDs is to make sure you see the birthdate, even if it's partially obstructed by a wallet, so the prosecutor might not have much sympathy for the argument.
The police don't use fake IDs in sting operations of this nature.

