This is indeed a talisman, (tangkal or azimat/zimat or jimat). This type of talisman, once opened, the "strength" is gone. The azimat is 'void'.
The portion between the 2 stars is known as "Khatimus Sulaiman". It's purpose is to protect it's wearer against "black magic" and evil spirits (god's willing).
It is a combination of a number of
azimats mainly for protection against supernatural elements.
