(Los Angeles) Los Angeles, Cal, March, bold cds (LOS-5670, R5) with matching "Paid 3" in circle handstamp overstruck "Paid 6", on c. 1855-56 cover address to Lieut. Du Barry at Fort Yuma, with "via San Diego" routing endorsement, Very Fine, a rare usage to Fort Yuma via U.S. mail and non-governmental courier, ex-Knapp. Estimate  $1,000 - 1,500. Carried by U.S. Mail between LA and San Diego. At that point the U.S. Mail service turned it over to a military express or to the Desert Dispatch express which operate between Fort Yuma and San Diego as no mail service was establish between the two locations. $0 (Image)