Description from an eBay seller.  I will try and find out more about this.
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-- James
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This is a flap that was made privately by a member of Aracoma Lodge. The 
drum and dance teams from Watonala Lodge and Aracoma Lodge have a close 
working relationship. For several years the two teams have jokingly 
referred to themselves as Watocoma Lodge, combining the first four 
letters of Watonala and the last four letters of Aracoma. The lodge 
number on the flap, 650, is the sum the lodges actual numbers (169 + 
481). The artwork features the totems of both lodges.

For Watonala, this flap should probably receive the designation ZS2. 

For Aracoma, this flap will probably get the designation ZS6.