MULLER, SCHALL & CO.
R170p Hyphen Hole 40 cent documentary
For a reason unknown to me, Muller, Schall, a securities firm, used a large number of R170p and R172p hyphen hole documentary stamps. These hyphen hole stamps are the scarcest of the documentary set. An R172p used block of six cancelled by Muller, Schall has appeared twice on this site.