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   Brt-1604c.
  Wt = 11.64g. Diam = 29.7-29.9mm  | 
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   Photo from Bob Johnston  | 
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   Photo from Glendining, 3-4 October 1988 lot
  509 (from Bob Johnston)  | 
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   Wt
  = 11.63. Diam = 30.3mm  | 
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   Photo from Zeno 113287 posted by Lingen  | 
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