An excellent neighbour decapped a Tamago I sent him. So now we know what’s underneath the blob on the Tamago board.
Or well, not quite. The next step is identifying what is on the chip.
The chip has two logos. The first is possibly a lot number:
Another number also appears on the board (bottom right), it might be GFI435.
Unfortunately, neither of these mean much to me, and I can’t identify the device. So now I don’t know what’s under the blob in much greater detail