12c Black (17). Position 60L1, with huge straddle-pane margin at right, showing centerline and portion of Position 51R in the right pane, other margins full to just in at top, circular datestamp cancels, Fine and extremely rare, since the definition of straddle-pane has been updated and refreshed--a portion of the adjoining pane's stamp must be present or it is an "interpane" margin--the vast majority of 1851 Issue stamps in Power Search described as straddle-pane no longer qualify for that term, this 12c is particularly rare, ex Ishikawa

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