The following cancel is classified as Type 3as
In the above example, no killer bars are present. In order to kill the stamp,
a target killer (concentric circles) was used.
The following cancel is classified as Type 3b (BC-XTX)
In the above example, the top and bottom killer bars are missing (that's what the
"X" in the "XTX" means).
The following cancel is classified as Type 5bhks (XOX)
In the above example, the top and bottom killer bars are missing.
Locy System for Classifying Naval Postmarks, As Revised ©, of the Universal Ship Cancellation Society is excerpted and reprinted with permission.