The Vikings at 831 AD (2 o'clock on the time device). You should also bring the gunpowder from lower on the Great Wall, so that you can open the Viking cave.
The hammer-shaped Thor amulet goes to the Vikings at 831 AD (2 o'clock on the time device). Take the gunpowder from the Great Wall, too, to blast open the cave there.
On Time Tangled Island, go to the Great Wall of China (6 o'clock, 1593 AD ). At the upper right, atop the scaffolds, you will play a memory game against the old man. When you win, you get Thor's hammer shaped amulet (for the Vikings at 2 o'clock, 831 AD). (*you should also pick up the barrel of gunpowder at lower right)
Not really, it has same stats as normal strength amulet, but strength amulet (t) just looks better.
The 'scarab'
There is a Golden Vase on Time Tangled island, which is hidden in a cave at 831 AD and needs to be returned to 328 BC. There is the "fingo", an urn-shaped artifact, on Nabooti Island.
its a rock that is shaped like a hammer
The hammer is shaped as it is so as to exert the maximum amount of force at the culmination of it's swing.
Hammer heads are NOT all "like a hammer". They come in many different shapes.
The island was boat shaped
hammer cop
A Mallet
it can be shaped easily with a hammer.