I passed this onto Leopold Beaudet, the editor of
The Admiral's Log, the journal of the
Admiral Study Group (of the British North America Philatelic Society).
Leo is the leading expert on the Admiral stamps of Canada.
His reply:
Quote:
Very nice misplaced entry. Thanks for the note.
The stamp is Marler's design type 6 (Mark in A of TAX and break in the lower left vertical line between horizontal lines 4 and 10). Design type 6 stamps are from plates 11 to 16. Marler describes the following re-entry on 15UL28:
"Marks of a second entry in the three letters of 'WAR'"
He illustrates this re-entry in his 1982 book, p. 422.
Marler describes a similar re-entry on 14UL45:
"Marks of a second entry in the 'W' and 'R' of 'WAR', not to be confused with [the re-entry on 15UL28]."
I believe the misplaced entry posted on SCF is 15UL28.
Feel free to post the above notes.
A picture of this from the Marler book:

Robin