American Philatelic Association, American Philatelic Society · Altoona, Pa. : [American Philatelic Association] · leaf 11
that the late H. S. Mandel, who has been "through the Stamp Printing Office in St. Petersburg, insisted it could not exist, "because their machinery was such it was impossible for any inverted center to "occur; but it exists just the same." I regret not being able to present anything of much…
