Post Office Seal, 1919, black, perf 12, "Made in USA" watermark. Vertical strip of three, two strikes of purple Richmond Va. registered cds, bottom seal faulty, otherwise Very Fine, previously unreported variety. Scott No. OX21 var.  Estimate $300 - 400. This watermark variety was reported in the Perkal & Kazman book, but never seen on an official seal. This variety was found by Kotanchik after publishing his book. $0 (Image)