VERY FINE. FEWER THAN FIVE TRANS-RIO GRANDE COVERS ARE RECORDED WITH BOTH CONFEDERATE AND MEXICAN POSTAL MARKINGS.
Single envelopes (or outer address sheets) were rarely used for the entire trip with the intermediary's address and final address together. F. Groos & Co. was a large cotton broker using the Eagle Pass-Piedras Negras crossing. In September 1863, some letters addressed to the care of his firm at Piedras Negras were posted at the Monterrey post office in Mexico, then forwarded across the river with C.S.A. postage added to the letter. Fewer than five such letters are known with both Mexican and Confederate frankings and postal markings.
Illustrated in Special Routes (p. 158). Ex Birkinbine
VERY FINE. RARE USE OF THE 5-CENT DE LA RUE PRINTING ON A COVER CARRIED ACROSS THE RIO GRANDE BETWEEN PIEDRAS NEGRAS AND EAGLE PASS, TEXAS.
The Eagle Pass post office was used as the drop point for C.S.A. mail originating in Piedras Negras and addressed to San Antonio.
VERY FINE. AN OUTSTANDING TRANS-RIO GRANDE COVER, CARRIED TO PIEDRAS NEGRAS AND ACROSS THE RIVER TO EAGLE PASS, WHERE IT ENTERED THE CONFEDERATE MAILS TO SAN ANTONIO.
Brach-Shonfeld & Co. and F. Groos & Co. were prominent commercial firms involved in the cross-border trade between Mexico and the Confederate States. The addressee, Dr. W. G. Kingsbury, was a director on the board of the San Antonio Mutual Aid Society.
Illustrated in Special Routes (p. 158).
VERY FINE. AN EXCEEDINGLY RARE DOUBLE-RATE CONFEDERATE GENERAL ISSUE FRANKING ON A COVER CARRIED ACROSS THE RIO GRANDE AND PUT INTO THE MAILS AT EAGLE PASS DURING THE FEDERAL OCCUPATION OF BROWNSVILLE.
Brownsville was occupied by U.S. forces from November 7, 1863, to July 20, 1864. During this time, mail between Mexico and the C.S.A. was carried across the border further up the Rio Grande between Piedras Negras and Eagle Pass.
Johann August Forcke, a German immigrant, arrived in Texas in 1845 and was a practicing pharmacist in New Braunfels for 50 years (source: http://www.sanjacinto-museum.org/Herzstein_Library).
Ex Brooks. With 1984 P.F. certificate