A postal cover sent from Johnson, Arizona to Tombstone Arizona is to cross the block at Heritage Auctions' Legends of the West sale on June 11.
The letter was mailed in 1908 and bears the instruction "Care of the Sherriff's Office".
It was sent to JB Neal, who at the time was imprisoned in the Cochise County Jail for murder.
The back of the envelope features various notes and scrawls, presumably made by Neal in his cell.
The town of Johnson was established in 1900 and had some prosperous years, but was badly affected by the Depression.
The post office closed in 1929.
It's now a ghost town.
No estimate is available for the lot, but memorabilia associated with Tombstone's golden age is highly prized by collectors.
A Sioux scalping knife, complete with scalp lock, is another fascinating (albeit grisly) lot.
The Sioux collected scalps from the bodies of their slain enemies.
A note accompanying the lot indicates the scalp belonged to a white woman, according to the elderly tribesman who sold the blade.
Amos H Gottschall, a medicine salesman, collected the piece while travelling in the southwestern states sometime between 1871 and 1905.
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