Half cent black horizontal oriented mesh (appears to be Duckworth paper classification #4) .
Scott Unitrade #21iv Spur in scroll at left (one of the 5 many positions of this variety)
Perforation: Approx 12 x 12
Postmark: unidentified Montreal duplex (incomplete date with a 10 time mark at top)
Paper type: Appears to be Duckworth classification #4 an earlier printing of the half cent from the 'Large Queen period' 1868-1871 printings
For specialized descriptions of the Large Queens, see the publication: The Large Queens of Canada and their use by HE & HW Duckworth 2nd edition 2008 , Vincent G. Greene Philatelic Research Foundation, Toronto.
CONDITION NOTES: No creases, no tears, no thins -See magnified images front and back to judge the condition. -See magnified images front and back to judge the condition.