<https://mikewhiteuk.com/stamps/1915-usa-montenegroww1-patriotic-flag-censored-envelope-15407/#product>
<http://schema.org/description>
"1915 (Dec 29) coloured cryrillic Patriotic envelope with crossed USA &amp; Montenegrian flags to Niksich bearing Franklin 5c tied Painsdale/Mich cds &amp; with black framed Verificato /Per Censura &amp; red unframed Bologna /Posta Estere hand stamps…………….very unusual WW1 patriotic envelope"
<https://mikewhiteuk.com/stamps/1915-usa-montenegroww1-patriotic-flag-censored-envelope-15407/>