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So since #157 was issued in 1873 it's probably not a 157? Is that what you mean?
No. Just the opposite. The cornercard is the printed return address in the UL corner of the envelope. It identifies the sender as being in "Charleston, South Carolina" and that is consistent with what can be read of the postmark.
Now, when you look at the written address, you find that the addressee is also in Charleston, S.C. Therefore the 2c rate is for local delivery, not regular first class. All that is in keeping with the period when the 2c National and Continental stamps in brown were current. So now it comes down to color and secret mark. On my monitor the shade of the stamp seems a bit dark for National, and I do believe the closeup shows the closed loop and little diagonal hashmark of the 2c Continental secret mark.
So I would call it a 157 based on what I'm seeing on my screen.