Postal card from Copenhagen to Fellin (Livonia, Imperial Russia), present-day Viljandi in Estonia. Sent 18 January 1905, arrived 9 January 1905. No mistake. Russia still used the Julian calendar, which was 13 days behind the Gregorian calendar in Western Europe. The Gregorian date for 9 January was 22 January. The postal card's journey took four days.
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<span class="int-own-work" lang="en">Own work</span>