Here's something I've just discovered and thought interesting enough to pass along.
Just won this US Lincoln with a cool cancel labeled New York City foreign mail. The stamp was labeled as a SC#159, but I have my doubts. The
ebay image was not clear enough to make out the revisions. I have a #148, but if this turns out to be another one, the cancel will make up for the duplication in my collection.

Please excuse the crude screen capture, I couldn't copy the
ebay image directly.
Researching the foreign cancels, I found this website which explained the origins and usage.
http://www.stamp-collecting-world.c...s_NYFM1.htmlA new area of collecting?