Looks like this one, ATK RT-10.
https://www.telemark-pyrenees.com/binding/atk-rt-10 But this one only has a release value up to 10.
the original RT-12 has been replaced by the ATK R-12, which has a different base plate for the toe.
https://www.telemark-pyrenees.com/bi...-r12?var=63310