B3A1C3K5S1T1A1M3P3
21 points
BACKSTAMP is validvalid
to postmark the back of an envelope [v BACKSTAMPED, BACKSTAMPING, BACKSTAMPS]
a mark stamped on the back of an envelope [n -S] / to mark with a backstamp [v BACKSTAMPED, BACKSTAMPING, BACKSTAMPS]
to postmark the back of an envelope [v BACKSTAMPED, BACKSTAMPING, BACKSTAMPS]
a mark stamped on the back of an envelope [n -S] / to mark with a backstamp [v BACKSTAMPED, BACKSTAMPING, BACKSTAMPS]