Original signed pencil sketch of a bust-length portrait of de Forest in profile on an off-white 8.5 x 11 sheet, signed in pencil, “Lee de Forest, ‘Doc,’” who adds “Carl Havelin, also a Pioneer.” Also signed by the artist, “Rosenberg, Wash–DC–54.” The sheet is affixed to its original 11 x 15 mount, signed and inscribed on the mount by the artist, “To Carl Haverlin, with highest regards, Manual Rosenberg, The Advertiser Magazine.” In very good condition, with scattered toning and light staining. Pre-certified PSA/DNA.
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