This, as a multi cache, will earn you that souvenir.
This cache is placed to coincide with a CITO I organized on the 10th August but will be available after that as well.
The cache is a micro film canister, magnetically attached.
To find the final location of the cache, you must go to the above co-ordinates, where you will find some phone numbers of the local residence association.
Find the following numbers, put them into the formula and then off you are to find the cache.
Phone Number 1 is the number of the BOSS. It is ABCDEF
Formula:
N51 15 . (c-b) (a+b+f) (a+f)
W000 51 . b f (a+f)
Good Luck