Dial and Killer Examples
The Dial is the part of the cancel that usually contains the name of the ship and the cancellation date. The dial is typically round although other styles exist.
The Killer is the part of the cancel usually to the right of the dial that is applied over the stamp(s) to mark them as used. Several types of killers are used in Naval Cancels. One of the most common is a set of bars (usually referred to as "killer bars") which sometimes contain text between them.
Dial and killer from a Type 3 cancel on a cover from the light cruiser U.S.S. Honolulu CL-48
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