The paper used by the American Bank Note Co. had considerable variation in thickness. I don't have any data on the 1890 series but the 1879 3 cent issue on the same paper varies from .0027 to .0036 inch (.069-.091mm).
Disclaimer: While a tremendous amount of effort goes into ensuring the accuracy of the information contained in this site, Stamp Community assumes no liability for errors. Copyright 2005 - 2026 Stamp Community Family - All rights reserved worldwide. Use of any images or content on this website without prior written permission of Stamp Community or the original lender is strictly prohibited. Privacy Policy / Terms of UseAdvertise Here