The postage stamps of the old German State of Württemberg, issued between 1851 and 1857, hold a special place in philately due to their rarity, historical significance, and value. These early issues, known for their simplicity and distinctive designs, reflect the era’s cultural and economic nuances. Among the notable stamps from this period are the 1 Kreuzer, 3 Kreuzer Yellow, 6 Kreuzer Green, 9 Kreuzer, and 18 Kreuzer stamps. Each of these denominations is sought after by collectors, whether mint (postfris) or used (gestempeld), for their rarity and historical importance.

**1 Kreuzer Stamp (1851)**: This stamp, with its modest denomination, was often used for local correspondence. It features a clean, classical design with the denomination clearly marked in a decorative frame. Postfris examples are rare due to the typical use of the stamps shortly after issuance, making lightly cancelled versions prized as well. The 1 Kreuzer stamp stands out for its well-preserved postmarks and vivid impressions, which increase its value substantially.

**3 Kreuzer Yellow (1851)**: Perhaps the most notable for its striking color, the 3 Kreuzer Yellow is among the most eye-catching of Württemberg’s early stamps. Pristine, postfris versions are exceptionally valuable due to the challenges of preserving bright yellow hues over time. Even in gestempeld condition, stamps with clear, legible cancellations are highly sought after by collectors, as they represent authentic use during a fascinating period of European postal history.

**6 Kreuzer Green (1851)**: The 6 Kreuzer stamp, with its deep green color, was primarily used for more distant mail routes. Its design was similar to that of the 1 and 3 Kreuzer stamps, with the denomination framed elegantly. The green dye often faced issues of fading, which makes well-preserved specimens in postfris condition quite rare. Stamped examples are valuable as well, particularly those with distinctive regional postmarks.

**9 Kreuzer and 18 Kreuzer Stamps**: These higher-denomination stamps, used for more substantial mail charges, are among the rarest from this period. The 9 Kreuzer has a unique appeal due to its rarity in both unused and used conditions. The 18 Kreuzer, often found in very limited numbers, is especially coveted in postfris form, though even gestempeld versions command significant attention. Their high face value at the time meant they were less frequently issued and thus scarcer today.

Collectors prize Württemberg’s early stamps not only for their beauty but for their embodiment of mid-19th-century European history. Each example, whether postfris or gestempeld, tells a story of early mail routes, evolving postal systems, and the enduring craftsmanship of classic stamp engraving. The preservation of these stamps offers a glimpse into the vibrant postal history of Württemberg, making them a cherished addition to any advanced collection.