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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.

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 << SGTF Special Operations
POTAM Birn
Geocaching Reference Number TB29NY5

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

 
POTAM Birn Tracking Bug ImageCurrent GOAL:
Your TOP SECRET mission (codename BIRN) is to further this Special Reconnaissance (SR) evidence through any means possible to help it reach its destination 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 GCWBRF cache for further exploration have been initiated.
  
   
     

Operatives who have logged this TB...

  • First Lieutenant TNE
    •  (Sun 26 Jul 2009 @ 14:37:59 BST; 1248615479 seconds since Unix Epoch (POSIX) 01 Jan 1970 00:00:00 UTC)
  • Chief Warrant Office BRONCNUT
    •  (Sun 26 Jul 2009 @ 16:47:10 BST; 1248623230 seconds since Unix Epoch (POSIX) 01 Jan 1970 00:00:00 UTC)
  • Honorable Discharge CONDORMAN
    •  (Mon 27 Jul 2009 @ 9:15:03 BST; 1248682503 seconds since Unix Epoch (POSIX) 01 Jan 1970 00:00:00 UTC)
  • Honorable Discharge FLAGMAN
    •  (Thu 01 Jun 2023 @ 20:50:43 BST; 1685649043 seconds since Unix Epoch (POSIX) 01 Jan 1970 00:00:00 UTC)
  • Honorable Discharge THEJJDUO
    •  (Mon 26 Jun 2023 @ 22:12:09 BST; 1687813929 seconds since Unix Epoch (POSIX) 01 Jan 1970 00:00:00 UTC)
  • Green Beret STANSD
    •  (Wed 28 Jun 2023 @ 13:16:37 BST; 1687954597 seconds since Unix Epoch (POSIX) 01 Jan 1970 00:00:00 UTC)
  • Green Beret DICKANDALE
    •  (Thu 07 Mar 2024 @ 18:51:21 GMT; 1709837481 seconds since Unix Epoch (POSIX) 01 Jan 1970 00:00:00 UTC)
  • Honorable Discharge MPARK65
    •  (Mon 17 Jun 2024 @ 9:31:09 BST; 1718613069 seconds since Unix Epoch (POSIX) 01 Jan 1970 00:00:00 UTC)
  • Honorable Discharge MAGICN3
    •  (Mon 17 Jun 2024 @ 12:41:55 BST; 1718624515 seconds since Unix Epoch (POSIX) 01 Jan 1970 00:00:00 UTC)
  • Green Beret MIKE2FIND
    •  (Thu 20 Jun 2024 @ 4:48:19 BST; 1718855299 seconds since Unix Epoch (POSIX) 01 Jan 1970 00:00:00 UTC)
  • Green Beret FEBONIOCLAN
    •  (Fri 21 Jun 2024 @ 14:52:23 BST; 1718977943 seconds since Unix Epoch (POSIX) 01 Jan 1970 00:00:00 UTC)
   

 


*Disclaimer: Stories here and at FBZ caches are a combination of historical conjecture, anecdote and pure fiction. Any similarity to any event, group, or person living or dead is merely coincidental. Additionally, SGTF has utilized a variety of signs/stickers as props in the FBZ geocaching series. Labels or warnings (e.g. biohazard, radioactive, etc.) which are fictitious will display some form of the SGTF/Silverback moniker; all other warning signage encountered during this or any other FBZ adventure should be respected and observed as posted.


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   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).