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Skinner-Eno as PP-T1 on page 164 indicates use in 1861-66. They gave an illustration of it on cover as well as a sketch of it. My other example is not at all centered on the stamp, but ties a #65 to cover. I have not been able to determine a year for the cover so cannot add to the date range Skinner & Eno posit. Oddly, my two and two other examples not in my collection I have seen of the "pine tree" cancel all have the tree pointing downwards, and to the side. Another fifth example I have seen shows it pointing to the side. Makes me wonder if it was a pine tree or a spinning top, cause there is a slight curve at the bottom branches of the tree! But Skinner & Eno called it a pine tree so that's the standard description.
6637
Menomonee
WI
Geometric
Crossroads
1875
Crossroads. The cover also had the CDS in blue.
6638
Unknown
San Francisco
CA
Wedge
Wedge
1880
Contributed by Peter Adams. Dave is probably before Oct 1, 1883 when rate changed to 2 cents