Civil War era Envelope 3 cent stamp # 83? Petersburgh Virginia 1861-1866

1861-1866 Civil War era envelope with a 3 cent stamp. Postmarked Petersburgh, Virginia, April 27th. The letter was sent to Utica, New York. On the front is written #83 16x18 in pen. The back has some writing but cant make it out. The envelope has no holes in it or letter in it. The right side of the stamp has no perferations. Stored in a smoke free home.