I am a newb when it comes to stampless covers and wonder what I have with this cover I just bought. This single lettersheet was sent in 1833 from Lancaster Ohio to the county clerk in Hocking county which is about 18 miles away.
It has a "12" on it which is presumably the post-paid rate. I know the rate for 81-150 miles was 12 1/2 cents, but the markings indicate 12, not 12 1/2 and unless I made a mistake, the single lettersheet rate in 1833 was 6c. Can someone help me understand what is going on with this cover?