#65 on a pretty Boston cover with an unlisted fancy killer

We checked every catalog we have and can only conclude this may be an unlisted Boston fancy killer. We did find the 26mm red concentric postmark, which was paired with this unlisted killer in the Blake & Davis book, "Boston Postmarks to 1890." Based on the fact the postmark was used between 1861 & 1865 and the firm "Edwards, Nichols & Richards" reorganized under a new name in 1865, we can conclude this was sent before 1865.

Earliest documented use - 2/21/1861

Latest documented use - 7/4/1865