The postage stamps of Schleswig-Holstein from the period 1865-1867 are among the most historically significant and valuable in philatelic circles, reflecting a tumultuous era in European history. Schleswig-Holstein, located between Denmark and Germany, was a contested territory during the mid-19th century, experiencing complex political shifts. These stamps were issued under the short-lived joint administration of Prussia and Austria, following the Second Schleswig War (1864) and preceding the full annexation of the region by Prussia in 1867.

The first stamps of Schleswig-Holstein appeared in 1865 and are notable for their simplicity and elegance. The designs typically feature the coat of arms of the duchy, which combines elements from both Schleswig and Holstein. They were printed in various denominations, such as 1¼ schillinge (a common value), as well as ½, 1, 2, and 4 schillinge. These denominations reflect the local currency system of the time. The stamps were engraved using the typography printing process, which gives them a distinct and clear appearance.

One of the most coveted stamps from this period is the 2 schillinge blue, which was produced in limited quantities and remains highly sought after by collectors. The rarity of these stamps is partly due to the political instability of the region. In 1867, the postal service of Schleswig-Holstein was absorbed into the Prussian postal system, halting further production of these stamps. As a result, original examples are scarce, especially in good condition.

The Schleswig-Holstein stamps from this period hold considerable value today, not only due to their rarity but also because they serve as historical artifacts from a pivotal moment in European history. Philatelists prize these stamps for their connection to the geopolitical struggles of the time, as well as for their distinctive, period-specific designs. Pristine specimens can command high prices at auctions, particularly those with unique cancellations or from limited runs.

In summary, the 1865-1867 postage stamps of Schleswig-Holstein are a rare and historically important chapter in philately, representing a fleeting but significant moment in the region's postal history and offering collectors a tangible link to the past.