I paid a premium for this item. Quite irresistable, I think. Good 1899 4c overprint with the narrow spacing, the much more expensive $10 stamp. Also note the change of the usual month of August to June in the date stamp.
Proven and good quality Madame Joseph fakes can command higher prices than the genuine article. The literature refers to a fixed date cancellation of 22 AUG 1911. This marking has the month of JUN. I wonder whether there is such a thing as a forged Madame Joseph GPO postmark.
For more information, may I refer you to my initial post in August.