Selling one Circulated 1911 4c Washington Stamp. Historical info belowQuestions welcome. Check out my other items. We are happy to offer combined shipping and will revise the invoice to reflect the cheapest shipping cost given the number of items sold. Comes from SMOKE-FREE HOMESelling the Actual item depicted in the pictures as shown in "Gallery" picture. Remaining pictures are provided for further details. Please zoom in on the pictures and if you have any questions feel free to message me.In August of 1910, the Bureau of Engraving and Printing made the decision to change the USPS watermark.In addition to reducing the size of the letters, the style was changed from a double line to a single line.The purpose was to strengthen the paper and give it a more uniform thickness, since the old watermark had a tendency to weaken the structure of the paper.