The key U.S. Private die proprietary revenue medicine stamp from Holloway’s Pills & Ointment, 80 Maiden Lane, New York, NY.

Scarce VF (~45 recorded, 80% damaged) #RS125a: 1¢ blue on old paper, excellent color, 4 clear margins, imperforate, used (minor stain), with the top frame line of the stamp below clearly visible, minor thins/tear (see scans for appearance).

Grab this fantastic M&M today!!

Note: Private Die Proprietary Revenue stamps were usually torn in opening the box or container. Values quoted in Scott are for F/VF examples that may be somewhat faulty but reasonably attractive, with a faults usually not readily apparent on the face.