Historical places in Halikko.
1. The first coordinates bring you to a historical place in Halikko. From this place you get the latitude of the final cache. The coordinate is N 60°23,X where X is Y-1543, where Y is the year until which a toll was collected from the travellers in this place (to find the information refer to the info plate).
2. The coordinates of the second place are N 60°22.966 E 23°02.889. Longitude of the final cache is E 23°03.Z where Z is (M*4)+2 where M is the number of teeth in the uppermost gearwheel (including the missing one eaten by the teeth of time). Edit. 6.2.2021 Because the museum is closed, here is the answer, 56 teeth.
3. Find the final cache. Be aware of the treacherous cliffs near the cache.