The stamps issued by the historic German state of Württemberg from 1875 to 1916 hold a special place in philately, prized for their rarity and historical significance. Württemberg, nestled in the southwestern part of Germany, had its unique approach to postal operations and administration. Among its most notable issues are the *Dienstmarken für Gemeindebehörden*—service stamps used for official purposes marked with "Dienst Sache" ("official matter"). These stamps were employed exclusively by municipal authorities for official government correspondence, making their survival in excellent condition quite rare.

A highlight among these service stamps is the **3 Pfennig brown**, valued highly by collectors. This stamp, particularly in both postfrisch (mint, never hinged) and gestempelt (used, with a clear cancellation mark) conditions, captures the essence of 19th-century German postal history. The brown 3 Pfennig not only reflects its utilitarian roots but also embodies the meticulous engraving and printing practices of the era.

The **2 1/2 Pfennig gray** is another rarity that has captivated collectors, especially when found gestempelt. Its subdued color and modest denomination hint at its use in everyday municipal correspondence. Stamps such as this, surviving with legible cancellations, are gems for enthusiasts tracing the administrative and social history of pre-World War I Germany.

The **15 Pfennig lilac**, particularly sought after in postfrisch condition, stands out due to its distinctive hue and higher face value, indicating use for more significant official transactions. The scarcity of well-preserved, unused examples adds to its allure, marking it as an item of substantial value in specialized collections.

Another remarkable stamp is the **20 Pfennig green**, distinguished by its vivid color and medium denomination. This stamp is primarily found gestempelt and often shows cancellations that tell stories of government efficiency and regional operations. Its robustness and the clarity of the imprint make it a popular pursuit among collectors focused on Württemberg's postal heritage.

Lastly, the **7 1/2 Pfennig ochre** completes the list with its warm tone and particular importance for collectors seeking stamps marked with "Dienst Sache." This denomination, often seen used with crisp cancellations, exemplifies the practicality and design elegance of Württemberg's postal issues.

These stamps collectively serve as windows into the bureaucratic and operational facets of Württemberg's government from the late 19th to early 20th century. Their rarity, especially in pristine or well-preserved conditions, continues to enthrall collectors and historians who appreciate the confluence of art, utility, and heritage in postal history.