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Duh Vinchi's Cache Mystery Cache

Hidden : 6/28/2006
Difficulty:
3 out of 5
Terrain:
2 out of 5

Size: Size:   regular (regular)

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Geocache Description:

Puzzle 2 stage multi. Coords above are for first leg. Final cache is a camo'd lock 'n lock.
Puzzle may require research. PLEASE READ ENTIRE DESCRIPTION.

I'm a bit of a history buff and have always been interested in the various "secret societies", fraternal orders, social clubs, etc. that have come and gone. Many of these are dwindling rapidly as members die off and are not replaced by the younger generation. Perhaps other "secret" societies and fraternal orders have hidden treasures as well.
Waypoints are in NW suburbs (Des Plaines, Mt Prospect) area, but are not within walking distance of each other. You'll understand why this had to be so when you solve it.

For this cache: The above coordinates will take you to the meeting place of a society (yes, this can be done virtually). To find the final location: Find out the original name of this society . You can easily find this information online. The society has a national website with a history page -- you'll learn some interesting facts this way. This name will be two 5-letter words.
Your coordinates to the final will be: N 42 AA.AAA W 87 BB.BBB, where A is the first word and B is the second word of the name. Use the following cipher to convert the letters to numbers:

A-8, B-2, C-6, D-4, E-5, F-6, G-7, H-8, I-9, J-0, K-9, L-6, M-6,
N-7, O-0, P-2, Q-1, R-5, S-6, T-0, U-4, V-1, W-3, X-9, Y-5, Z-2

But you're not through yet! Next add the time ##:## that is special to this society to the North coords and subract it from the West coords. Those familiar with the area should have already guessed the general appropriate area of the final hide.

For the first 3 finders: "Gold" items fitting the theme.
Please do not post spoilers. There are caches near the final that will fit your pics.
I am not a member of this society and am not attempting to endorse them in any way.

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Additional Hints (Decrypt)

[check the coords to the final before you search] (]visit link)

Decryption Key

A|B|C|D|E|F|G|H|I|J|K|L|M
-------------------------
N|O|P|Q|R|S|T|U|V|W|X|Y|Z

(letter above equals below, and vice versa)