2c Pan-American (295).
Tied by Indianapolis Ind. May 1, 1901 9PM First Day machine cancel
on Mutual Mercantile Agency corner card cover to Cincinnati, clear May 2,
1901 backstamp, neatly opened at top, tiny edge tear at upper right, Very
Fine, with 1975 AFDCS certificate, Brookman catalogue value $3,500.00 (Image) 
5c Pan-American (297).
Tied by "Worcester, Mass. Sta. A May 1 2:30 PM" First Day duplex
cancel on European size cover to Munich, Germany, clear New York
N.Y. May 2, 1901 machine cancel and German receiving datestamps on back,
couple short perfs and faint toning around a few perf tipsVERY FINE. ONE OF THE RAREST OF ALL UNITED STATES COMMEMORATIVE FIRST DAY COVERS, WITH ONLY TWO SINGLE FRANKINGS OF THE 5-CENT PAN-AMERICAN ISSUE RECORDED.
The McCusker firm recently sold the other 5c Pan-American single franking FDC in (Sale #203 in February 2005) for $30,000 plus 15% premium for a total of $34,500. We cannot stress enough the significance of a First Day Cover with a single 5c stamp paying the UPU rate to a foreign country.
With 1982 AFDCS certificate (Image)
2c, 8c Pan-American (295,
298). 8c s.e. at top, each stamp tied by neatly struck Washington D.C.
oval, bold purple "Sub-Sta. No. 37, Wash. D.C. Registered May 1, 1901"
First Day circular datestamp on cover serviced by and with printed
corner card from legendary Washingtonh D.C. stamp dealer J. M. Bartels to
L. L. Green, who was an active collector and stamp club officer in Boston,
neatly opened at left and with Boston May 3, 1901 backstampVERY FINE. THIS COLORFUL AND BEAUTIFULLY COMPOSED FIRST DAY COVER IS THE ONLY KNOWN COMBINATION OF THE 2-CENT AND 8-CENT PAN-AMERICAN ISSUE POSTMARKED AT WASHINGTON D.C.
Brookman catalogue value for 8c value is $25,000.00 (Image)