The chains look grey, not green, in close-up.

http://archive.wizards.com/default.a...d/ag/20020816a

Spoiler: Half-Flesh Golem & Half-Clay Golem
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Spoiler: Half-Stone Golem & Half-Iron Golem
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The half-flesh golem has stitches - none of the others do. The half-iron golem's parts look much more mechanical than Serini's do though.