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Most 1926 combination covers are posted on [one on the CAM route[s]. This Dinnebier CAM-3 inaugural confusion cover was posted 'off route' [at NYC] one day early

Combination CAM-3 inaugural cover posted off the route a day early - at NYC, May 11 1926, 4 pm. Printed 'Night Air Mail to Chicago' endorsement; with straight line 'Night Air Mail' marking applied by postal service at New York. 15¢ franking pays for combined service: overnight transcontinental zone NY-Chicago 5¢, one route [CAM-3] 10¢. Chicago, May 12 1926, 5:30 AM inaugural cachet type 3 applied to face. Oklahoma City arrival postmark applied to reverse, May 12 1926, 4 pm; Oklahoma City general delivery postmark applied next morning, May 13, to face.