Shelly 1L 2-way switching with EU wiring (old standard)

Hello,

I'd like to ask for some help with figuring out the installation of a Shelly 1L to control a single light with 2 switches.

I have 2 standard switches which are wired the same, with the old EU standard and no neutral. Each of them has 1 live in and 2 switched outputs out as visible in img1 and they both switch the same, single light. Each switch has a single button.

I've been looking at the wiring diagram provided for the conversion of the old 2-way switching - is this applicable to my situation, as well?

If so, can you, please, help me understand what should I do with the wiring to make this work?

Thanks for your help in advance.img2.jpg

img1.jpg

Thanks for the quick replies.

SebMai - it's just my luck that my old multimeter died on me, so I had to order a new one to figure out which one is which. My house is quite old, so it's not exactly easy to say which one is which at the moment.

Albatros L-39 - I'll give it a go, thank you. Based on the attached diagram, I'd like to confirm that I'm reading it correctly - the Sx will be connected to where the live used to be on the switch and the SW1 to where the switched live used to be on the second switch? Also, do you have any suggestions as to how to get that connection across if the cables are already wired into the wall & tearing it down is not an option? The switches are approx. 5m apart.

Thanks a ton for both your replies.