Variant USS
Variant USS indicates that there are no periods in the “USS” prefix in the dial.
The following cancel is classified as Type 2-1(n+) (D1,USS) (FF)
Variant USN
Variant USN indicates that there are no periods in the “US” portion of “US Navy” in the dial.
The following cancel is classified as Type 2-1(n+) (D2,USS,USN)