a <#stamp> or stamps to which is attached the full adjacent <#gutter>, including <#perf=perforations>, and sometimes including portions of the stamp(s) on the other side of the gutter.  A guttersnipe is a <#freak> that may be caused by a paper fold or a misregistration in the production process.

see <#hpo=Highway Post Office>.

a printing of the 1962 Hammarskjold Issue with the yellow background <#invert=inverted>.  When several <#pane=panes> of the Hammarskjold <#stamp> unintentionally reached the public with the background inverted, the Postmaster General intentionally printed a large quantity of the <#error> for sale to collectors.

a <#cover> that is <#cancel=cancelled> at a post office window and returned to the person presenting it.  A handback cover is never carried in the <#mailstream>.

a <#cancel=cancellation> applied with a hand-held device, as opposed to a cancellation applied by <#machcancel=machine>.