stamps of Mexico
... that most of the stamps of Mexico from 1856 to 1883 have district overprints, which were added as an anti-theft device?
... that most of the <b id="mwArk"><a href="./Postage_stamps_and_postal_history_of_Mexico" id="mwAro" rel="mw:WikiLink" title="Postage stamps and postal history of Mexico">stamps of Mexico</a></b> <i id="mwArs">(example pictured)</i> from 1856 to 1883 have district <a href="./Overprint" id="mwArw" rel="mw:WikiLink" title="Overprint">overprints</a>, which were added as an anti-theft device?