New York, New York, 5c black on bluish wove paper, signed ACM, AC connected, horizontal strip of four, positions 6-9, large margins on three sides, just clear at left, showing portion of three adjoining stamps at top, tied to cover by blue manuscript cancels, the left stamp further tied by red "New York / Mar / 17" c.d.s., "20" manuscript in blue and curved PAID handstamp in red, to Charles G. Folger in Geneva, New York, a few adhesive remnants on reverse, light stain to front, right stamp with diagonal wrinkle, yet a rare franking, one of four recorded; handstamped WHC (Warren H. Colson), ex Grunin, Zoellner, with 1998 Philatelic Foundation certificate.  
A rarity of exceptional quality, arguably the finest of the four recorded strips of four on cover. USPCS Census 20501.   Illustrated and discussed in USPCS Chronicle Volume 32, No. 3, page 3, "The Five Most Outstanding New York Postmaster's Provisional Covers" by Philip T. Wall)