There is only one page which contains information about this Tissot Research watch – watchuseek.com.
This watch has a Calibre 4009 movement. Both batteries need to be inserted with + facing outside of the watch.
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The movement in my watch was unfortunately not working. Most likely the IC was broken – the sealing of the IC got visibly separated from the PCB and might have caused the delicate internal wires to snap. I installed Calibre 4012, also branded Tissot. It is smaller in diameter and has the button tabs placed more outwards. I was possible to adapt it to fit the case and match the position of the buttons.