Jewish Medals

Cyrus Adler and Albert Wolf Soon wrote in the Jewish Encyclopedia that the first engraved Jewish medals were from the middle of the fifteenth century.  

They bring some later examples such as: 

1875. Synagogue at Pribram with a shield of David on the reverse

1888. Founding of a Frankfort lodge with a shield of David on the obverse

1900. Stepney Jewish School: with a shield of David on the reverse.

ornate sculptings

Photo of amazing ornate sculptured hexagram is courtesy of Ben Piven from Flickr.

Another Indian motorcycle

Photo is courtesy of Ben Piven from Flickr. I'd like to know what is the symbol inside the hexagon.