To continue, the green, 3-Cent U.S., "Washington," definitive used to send the mail is in very fine condition! The fancy cancel from the D.C. P.O. is very fine! The CDS cancel(07/14/70-72) from the D.C. P.O. is quite nice, too!
Lastly, as for the envelope, it's in fine-very condition for something 152 or so years old! It's quite clean! There is a small tear at its bottom, right corner(at the back), caused when the envelope was first opened. The right edge is thus a bit jagged, too. The back flap is about 95% complete, though! Simply put, this is a nifty example of mail from U.S. Navy Paymaster, Edwin Stewart, to his dear wife!" Sadly, she would die in 1875.