Bannack City Express, A.J. Oliver & Co., cover franked with 3c red brown, cancelled with rosette fancy cancel in black, alongside "Cleveland O / May / 27" c.d.s., fair strike of "BANNACK CITY / EXPRESS" tombstone, reduced on three sides, resealed at top, overall wear, to Bannock City, Idaho; this portion of the Idaho Territory became part of Montana Territory on May 26, rare.
A.J. Oliver & Co operated the Bannack City Express from 1862-66, running from Bannack to the Utah Territory.