The Kingdom of Bavaria (Bayern) holds a special place in the history of philately, being one of the earliest German states to issue postage stamps. Bavaria’s first stamps appeared in 1849, and many of these early stamps are now highly prized by collectors due to their rarity, historical significance, and unique designs. Among these notable stamps are the *18 Kreuzer Yellow*, the *6 Kreuzer Blue*, the *6 Kreuzer Brown Freimarke*, and the *3 Kreuzer Green Freimarke*.

**18 Kreuzer Yellow (1849)**  
The *18 Kreuzer Yellow* is one of the most famous stamps from Bavaria, issued in 1849 as part of Bavaria’s first stamp series. It is notable for being a high denomination stamp, used primarily for international postage. Printed in a striking yellow color, this stamp is sought after not only for its beauty but also for its rarity. Its value increases exponentially when found in good condition, as many were heavily used or damaged over time.

**6 Kreuzer Blue (1849)**  
The *6 Kreuzer Blue* is another stamp from Bavaria’s inaugural series. Released alongside the 18 Kreuzer, this stamp was used for domestic letters and quickly became a common feature in Bavarian postal history. Its deep blue color and intricate design make it a favorite among philatelists. Despite being more common than the 18 Kreuzer, early editions in pristine condition remain highly desirable.

**6 Kreuzer Brown Freimarke (1850)**  
In 1850, Bavaria issued the *6 Kreuzer Brown Freimarke*, which featured a slight color variation from the earlier blue version. This stamp is a representative of Bavaria’s continued development of its postal system. While not as rare as the earlier blue Kreuzer, the brown Freimarke holds significant historical value, marking a period of transition in Bavarian postage. Its appeal to collectors lies in its rarity in mint or lightly used condition.

**3 Kreuzer Green Freimarke (1862)**  
Issued in 1862, the *3 Kreuzer Green Freimarke* is part of Bavaria’s later series and was commonly used for domestic letters. Its green hue and relatively simple design reflect a more modern approach compared to the intricate patterns of earlier stamps. Though widely circulated, well-preserved examples are now rare and sought after by collectors who specialize in Bavarian philately.

These stamps from Bavaria’s early postal history not only represent rare and valuable pieces of philately but also offer a glimpse into the evolving postal systems of 19th-century Europe. Their scarcity and historical significance make them treasures in the world of stamp collecting.