regular secondhand price for iphone 6 now is around 1800-2000QRS with no flaws.
in the condition of your mobile lets do the math.
screen repair cost = 600QRS
Touch ID = I dont know a repair shop, but lets say 200QRS
minus the condition (water damaged) let say -400QRS..we dont know the future effect to the unit.
Total of = 1200QRS for the damages and repair..

1800- 1200 = 600QRS.

my offer is between 600QRS and 800QRS.

+974 50438942 viber me. thanks