Because I have not found and photos online:
This is how a Necomimi EEG looks like on the inside.
Below the sticker. Are 4 PH0 bolts.
A main PCB on top of a breakout-board and a

The large breakout PCB is secured by 2 PH00 bolts.
This is the 60Hz US Version.
Beware of the third PH00 securing the tiny main board below.

The main board looks to be a
Thinkgear TGAM1

http://wearcam.org/ece516/neurosky_eeg_brainwave_chip_and_board_tgam1.pdf

So to convert the notch filter to european 50Hz interference:
"Tie the M pad to VCC pad to select 60Hz, and to GND pad to select 50Hz notch Filtering frequency."

Blog: http://marcuswolschon.blogspot.de/2012/12/necomimi-eeg-on-inside.html
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