Human mind lah.. i feel it's not the image of a amulet that works. It's what type of gathas/mantras are chanted by the archan or luang phor.
Some forest monk hand pressed a rough image, then chant also very jalan!
But that's for people who wear amulets for effectiveness only like me.. those who collect for value and design are the ones likely to get con

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that is true la. for me any amulet that is chanted properly by a gd LP and with gd intention is a gd amulet and can be wear around ur neck and will be able to protect u when 'some' situation appear but not in all situation.. hahaha..