The following cancel is from the U.S.S. Lexington (CV-2) and is
classified as Type 3z (TBT)
The following cancel is from the U.S.S. Enterprise (CV-6) and is
classified as Type 7rz
Locy System for Classifying Naval Postmarks, As Revised ©, of the Universal Ship Cancellation Society is excerpted and reprinted with permission.