Lot
54 
Burlington Colo. May 23, second type cds on 1873 3¢ entire to Michigan with target cancel, lengthy letter datelined "Longmont", foxing and some wear, flap missing, otherwise F.-V.F. Estimate $100 - 150.
The Burlington post office was transferred to Longmont April 14, 1873, some five weeks before this cover was mailed, so it appears that this datestamp was transferred with the office and used until Longmont secured its own postmarking device.
Realized: $55