Picture courtesy of PPJ
It was totally 81 border stones that marked the town border of Kristiania/Oslo from 1878 to 1948. All stones are marked with a crown, a number - and on one side the letter K (=Kristiania) and the other side A (=Aker). Kristiania was the name of Oslo until 1924. Almost 40 of the 81 stones can still be seen in Oslo (according to PPJ).
The cache is a part of the PPJ-theme: Old Oslo Borderstones
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These geocaches are placed along the the Kristiania/Oslo border 1878-1948 (from east to west, like the stones are numbered):
Mer informasjon her: Kart og linker over grensesteinene og Bygrensesteiner Kristiania/Aker fra 1878
The cache terrain is rated to 3,5 because it is very steep and slippery on the way down. The stone is on top of a steep cliff above Mosseveien, and around it is spiky and thorny bushes. So make sure you wear boots with good sole and gloves are recommended when you take this cache, preferrable not in rain. On the other side, I had no problem to approach it a foggy day with light drizzle, so it is not that difficult.
The micro cache is black PETling with logbook inside, close to the old border stone.