You can find it in the rope pully system outside Leonardo Da Vinchi's Home.
In time tangled island.
its under the deck near leos workshop
It is not a "piece of metal" but a "peace medal" (offering denoting friendship). You can find it below the hole in the "bridge" at Leonardo's time (1516 AD) and return it to the Lewis and Clark expedition at 1805 AD.
Use the swing thing to move the platform near the peace medal.
You will find it where Leonardo Da Vinci is.
If it is not on the hook then something has gone very wrong.
if the peace medal is not there try going on to another one of the time thingies on the clock thing because that has never happened to me
The oracle is in the building on the hill on Time Tangled Island.
There are no horses, winged or otherwise, on Time Tangled Island.
The peace medal on time tangled island is on Leonardo Davinci's part of the island when you climb to the top of the waterfall and walk over to this mechanism and you will see it hanging there.
There are no more secret items on time tangled island, but if you are talking about winning the whole island, go onto youtube and type 'poptopica time tangled island.'
There were characters from Time Tangled Island on several islands during the promotional period for the island. When Time Tangled was released (2008), the characters were removed.