W.A. Sheaffer Pen Co. 311 Avenue H Fort Madison, Iowa Return Postage Guaranteed envelope. Not dated. Printed in top right: US Postage PAID Fort Madison Iowa Permit No. 12. Address to a local resident. We think this envelope was used to mail the monthly Sheaffer Review magazine to an employee in the 1940s. Measures 9 x 12 inches. Small tear in center of flap otherwise very good. (1 avail)