Hi,
first I will show the postcard with meant postmark.

What kind of postmark is this from New York on the left?? Is it something like "postage due" (because of the "T" in it)??
I know this from postmarks like this

There is a postmark from the "US Sea Post" with "17" and "T" that means "Postage Due".
Can somebody explain this New York postmark to me??
Juergen