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  Silverback Cipher  
 
Silverback hunters should be familiar with the “pigpen” or masonic cipher, which is a simple substitution cipher exchanging letters for symbols based on a grid.

This cipher can be used to decrypt directions and secret codewords at FBZ geocaches!

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 << SGTF Special Operations
POTAM Fury
Geocaching Reference Number TB29NXG

Worth 10 Points (Create an account to enter TB tracking number and earn points!)

 
POTAM Fury Tracking Bug ImageCurrent GOAL:
Your TOP SECRET mission (codename FURY) is to further this Special Reconnaissance (SR) evidence through any means possible to help it reach its destination at at N 37° 50.758 W 121° 56.068 (GCWBRF), the "Return to Planet of the Apes" California Command Center (formerly Devil's Spoon) in Mt. Diablo State Park.

About this item:
SGTF speculates this "long lost" 1999 promo card is an Archive P2 Inkworks promotional item. Per SGTF's AOR under "Operation Silverback," operatives to help forward this materials item to the GC210M6 cache for further exploration have been initiated.
 
   
     

Operatives who have logged this TB...

  • Honorable Discharge DUCK432
  •  (Mon 09 Mar 2009 @ 17:03:53 GMT; 1236618233 seconds since Unix Epoch (POSIX) 01 Jan 1970 00:00:00 UTC)
  • Honorable Discharge CONDORMAN
  •  (Tue 10 Mar 2009 @ 19:55:47 GMT; 1236714947 seconds since Unix Epoch (POSIX) 01 Jan 1970 00:00:00 UTC)
  • First Lieutenant TNE
  •  (Sun 26 Jul 2009 @ 14:37:05 BST; 1248615425 seconds since Unix Epoch (POSIX) 01 Jan 1970 00:00:00 UTC)
  • Chief Warrant Office BRONCNUT
  •  (Sun 26 Jul 2009 @ 16:45:58 BST; 1248623158 seconds since Unix Epoch (POSIX) 01 Jan 1970 00:00:00 UTC)
  • Honorable Discharge THEJJDUO
  •  (Tue 10 Nov 2009 @ 13:46:16 GMT; 1257860776 seconds since Unix Epoch (POSIX) 01 Jan 1970 00:00:00 UTC)
  • Honorable Discharge FLAGMAN
  •  (Fri 02 Jun 2023 @ 11:36:49 BST; 1685702209 seconds since Unix Epoch (POSIX) 01 Jan 1970 00:00:00 UTC)
  • Honorable Discharge DICKANDALE
  •  (Fri 14 Nov 2025 @ 14:05:18 GMT; 1763129118 seconds since Unix Epoch (POSIX) 01 Jan 1970 00:00:00 UTC)
   

 
   Operation Silverback Prize Ring SILVERBACK Prize Rings

Those who create an account on fbz.geocaches.org and enter mission codewords and POTAM tracking bug numbers receive points towards an Operative ranking. Operatives who achieve the rank of General (700 points) are eligible to receive an official silver Operation Silverback GC.com trackable ring from Oakcoins. Gold rings are available for those who reach the rank of Green Beret (or higher).