oval handstamp (FTB-100) on 1863 cover to Bannack City, Beaver Head Mines, Idaho Territory, 3c Rose (63) with blue target and "Denver City Col Aug 13" double circle datestamp, endorsed "Via Fort Bridger Utah" and backstamped August 19, very fine, one of two examples of this handstamp, this short-lived express operated from Fort Bridger to Fort Hall on the Snake River, then north on the Montana Trail to Bannack City