The Order of the Silesian Eagle 2nd Class was often awarded veterans of the post-WWI Polish actions somewhat similar to a campaign medal.  The vast majority were distributed in late-1923 to 1927 and were accompanied by an award certificate to members of the German Freikorps. 

The ribbon for the Order of the Silesian Eagle 2nd Class is a pale yellow divided into thirds with a central stripe of white.  The original ribbon was a little over 3cm wide (3.01cm to 3.09cm) and had a fine silk weave with an intricate weft design.  Replacement ribbons can be made of most any material - with a poly based weave and minimal weft design being the most common current production, making it almost twice as thick as the original silk ribbon!  These are only typical examples used for simplicity of explanation and is not an exhaustive list.

• Contemporary Order of the Silesian Eagle 2nd Class Ribbon:  Silk, the weave is 15 rows per cm, each thread is 2 strands of ca. 20 fibers per strand, and it is UV-negative.  Silk, the weave is 16 rows per cm, each thread is 2 strands of ca. 15 fibers per strand, and it is UV-negative.  Note:  Silk, the weave is 16 rows per cm, each thread is 2 strands of ca. 12 fibers per strand, and it is UV-negative or silk, the weave is 17 rows per cm, each thread is 2 strands of ca. 10 fibers per strand, and it is UV-negative is probably not an Order or the Silesian Eagle but rather a similar colored ribbon.  If suspected to be original, there is the further explanation of it being manufactired by an out-moded ribbon manufacturer.  
• WWII-era Order of the Silesian Eagle 2nd Class Replacement Ribbon: Silk, the weave is 15 rows per cm, each thread is 2 strands of ca. 15 fibers per strand, and it is UV-negative.  Cotton, the weave is 14 rows per cm, each thread is 2 strands of ca. 10-12 fibers per strand, and it is UV-negative. 
• Modern-era Order of the Silesian Eagle 2nd Class Replacement Ribbon: Often found in widths of exactly 3.00cm or 3.10cm.  Silk, the weave is 14 rows per cm, each thread is 3 strands of ca. 10 fibers per strand, and it is UV-negative.  Cotton, the weave is 13 rows per cm, each thread is 2 strands of ca. 15 fibers per strand, and it is UV-negative.  Poly, the thread melts and clumps when burned, the weave is 15 rows per cm, each thread is 2 strands of ca. 10 fibers per strand, and it is UV-positive.  Cotton, the weave is 14 rows per cm, each thread is 3 strands of ca. 8-10 fibers per strand, and it is a false UV-positive due to the use of a fabric finish. Poly-cotton mix, the weave is 14-15 rows per cm, each thread is 2 strands of ca. 10-15 fibers per strand, and it is UV-positive.  

Please see my other guides and blog (http://blogs.ebay.com/tsa-li) for further information.   Thanks for viewing!