Type 1 cancels have a standard dial at the left with the ship's name at the top, and four narrow killer bars at the right, spaced close together.

The following cancel is classified as Type 1s

The "s" variation indicates that serif letters were used for "USS" and the ship's name in the dial.

The following cancel is classified as Type 1

Locy System for Classifying Naval Postmarks, As Revised ©, of the Universal Ship Cancellation Society is excerpted and reprinted with permission.