Good day. This postal cover is accompanied by an 11th Corps soldier’s letter dated June 28, 1863, written from Middletown, MD. Postmark is Gettysburg, his corps having arrived in the town the morning of July 1, 3 days after the letter was written. I’m certain the letter matches the envelope because of other factors. My question: why no postal date in the Gettysburg postmark for early July, 1863? Any help is much obliged.