Full Hillsboro Ills postmark and manuscript Free on this cover to Jon Masters, Falleys Crossroads, Massachusetts (a rare destination in itself).  Masters wrote to Francis H. Hereford, who was then the postmaster, concerning the whereabouts of a Mr Raynolds. Hereford answers that he is now in (looks like) Placeville, WT. Closest I could find to that name is Platteville WT.  Some information on Hereford is below:

Montgomery County, Illinois – Its Early Officers and Citizens

By A. H. H. Rountree, in the Anti-Monopolist , April 29, 1874

Francis H. HEREFORD was born in Prince William County, Virginia and there raised. He came of a large and influential family of Virginia of large wealth and high tone. In 1824 he married Miss Catherine FOOTE of Fauquier County, a sister of General Henry FOOTE, ex-governor of Mississippi, ex-congressman, etc. who we believe now resides in Washington City.

Mr. HEREFORD moved soon after his married to Dover, Tennessee, and there commenced the manufacture of iron. In 1835 HEREFORD in company with Mr. KERCHEVAL came to Hillsboro and as partners engaged in merchandise, when they closed their partnership in the crash of 1837, and Mr. KERSHEVAL and his large family removed to Missouri. Mr. HEREFORD remained in trade still longer and became a partner for a time with Judge BREWER. Mr. HEREFORD having studied law engaged in its practice and was from time to time postmaster of Hillsboro. He was one of the early members of the Methodist Church, a trustee of the Academy. He had a family of seven: Frank, Henry, Benjamin, Richard, Alfred, Jane and John.

Small tear at top center near where seal was broken.