Coin ID Needed Please

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I'm thinking this may be a button....

mmmm, not a button I'm sure, that hole does no go all the way through, the dark bits are dried Thames mud and there is no corrosion albeit a fair amount of wear.

I'll find some one to test the metal type.

Yes a Jeton was what I thought it was, showed it to a UK specialist who demurred.
Brass or copper would surely have corroded.

Any chance of an image of the second side that is in focus? Certainly there is some readable lettering ... AME is visible at 12:00-2:00, the style of lettering suggesting 1550 or earlier (or imitating that era).

Certainly there were medieval gold coins from northwest Europe with a cross reverse, but it would be wafer thin, and likely weigh about 5 grams or less, so that might also help. I don't recognize that design, but there are others out here with more experience.

I agree that the dark areas look like plating flaking off, but you are in a better position to see if this is mud encrustation (raised bits on the surface).