Circular Grid - 6 Sections, bold strike ties 6¢ carmine, grilled (137), wide margins and deep rich color, on 1871 folded cover to London, England, bold blue "Herrmann & Co. New York, Apr 7 1871" oval, partial red "New York Apr 8" exchange cds, red London (4.19) arrival backstamp, Very Fine and choice use of the 6¢ 1870 grilled issue.; signed by Ashbrook on reverse. Weiss No. TR-G13  Estimate $400 - 600. ONE OF ONLY THREE RECORDED TR-G13 COVERS. $0 (Image)