Question about replacing Light Switch
Does this toggle switch marked " On " et " Off " ? If so that is single pole verison but it do not show any wording then it a very good chance you may got a three way switch.
I have a feeling that you did have three way switch due one screw is not normal colour more like red colour so that kinda give away as common screw.
If you going to change over to the new switch do it one at time or take a tape or something and marked one conductor with it so you know that is a common. ( this part is important otherwise you will have 3 combations to get this right. )
The answer will be based on NEC ( National Electrical code ) or CEC ( Cananda Electrical code ) or ECF ( Electrique Code France )