U.S.P.O. Despatch/Pre-Paid/One
Cent. Double-oval handstamp with eagle in red on brown envelope to
local street address, red star cancel struck directly over oval, neat June
4, 1852 docketing partly over ovalVERY FINE. A RARE EXAMPLE OF THE RED U.S.P.O. OVAL AND EAGLE HANDSTAMP APPLIED TO ENVELOPES SOLD TO THE PUBLIC.
Similar covers with this marking were sold in our auctions of the Robert B. Meyersburg and David Golden collections (Sale 791, lot 282, and Sale 817, lot 388). The use of the red star cancel is strong evidence that the envelope was sold to the public with the red U.S.P.O. oval to indicate prepayment.
Ex Chapman and Caspary. (Image)
U.S.P.O. Despatch/Pre-Paid/One
Cent. Double-oval handstamp with eagle struck in black on Jun. 2, 1856
printed notice announcing auction of damaged coffee, to local street
address, file fold, Very Fine (Image) 
U.S.P.O. Despatch/Pre-Paid/One
Cent. Bold red double-oval handstamp on blue Dec. 30, 1852 folded
letter to local street address, part of letter torn away, not affecting
cover, Extremely Fine (Image) 
U.S.P.O. Despatch/Pre-Paid/One
Cent. Perfectly struck red double-oval handstamp (without serifs), blue
"Philadelphia Pa. 5 cts. Apr. 30" integral-rate circular datestamp on 1853
blue folded notice for temperance meeting, to local addressee, Extremely
Fine, ex Worthington and Hatfield (Image) 
U.S.P.O. Despatch/Pre-Paid/One
Cent. Red double-oval handstamp (without serifs), black "Philadelphia
Pa. Jul. 12" circular datestamp and "Paid 1 ct." drop rate in circle on
buff cover to local street address, Very Fine, rare combination of markings
(Image)