Many people suspect the chand torra on the dumalla of Nihangs as a hindu symbol as the chand(moon) is linked to hindu demigod Shiva. But there is a Chand Shastar of Guru Gobind Singh Jee. It is kept at the Historical Gurdwara of Laxmipur, Bihar.
This is a sher panja shaster of Guru Sahib. This was worn around the knuckles as a knuckle buster, Laxmipur is a small village which has a lot of sikhs living in and around the village.
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ਸਤਿਗੁਰਬਚਨਕਮਾਵਣੇਸਚਾਏਹੁਵੀਚਾਰੁ॥