Pocket watch key ?!?

[digging65]

Hello,

Yesterday I was out on the fields for 2.5 hours with Urmas, nothing really significant but I found this strange little object.
I though initially that it could be a pocket watch key but I not very sure anymore because of the little tool hanging with the other part. Any idea on what it is ?

Kiitos !

[Kultaseppä]

Maybe the little one is a small screwdriver for calibration...?

[digging65]

Thank you for your hint. I will post this photo in the French forum and ask the same question. I will come back to you if something new there