Here is what Mr Trimble said about this stamp, he was very kind in replying to my email.
"Your stamp is a kiss print where the printed sheet slapped back down on to the wet plate picking up additional ink and smearing the ink on the paper. These are unusually common on the 3c SQ, though still quite collectable. Not constant, but always interesting!"
This is a Kiss Print. But interesting that, with the strength, you can see the design image in the duplicate image of the Kiss print. The curved arc and the letters ADA PO can be visualized in the duplicate image.
There is a listing in Unitrade (37iv) for the Early printing but not yet for the later printings (41).
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