Found the magnet, no logbook. Seems to be the 'cache'.
Photo available.

We are a little group of motorcyclists from Germany on a road trip through Poland, Lithuania, Latvia, Estonia and Finland.

GCId: GC6W2XZ
Owner: tombustom
Typ:
D/T: 2/1.5
Land: Polen
Region: Kujawsko-Pomorskie
Koordinaten : N 53° 7.744 E 017° 59.840
Gelegt: 25.10.2016
Status: ok

Gefunden: 08.06.2018