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A very Sesquicentennial 'confusion cover' with lots of confusion - including confusion on forwarding to the transcontinental route and confusing rate variations.

13S1 cover, Philadelphia-Washington with 24¢ postage that includes two 2¢ Sesquicentennial Liberty Bell stamps. Printed cachet depicting eagle on American flag and five lines of text in box, cachet 13a superimposed. Postage defaced at Model Post Office with machine cancel and two copies of duplex cancel, all with ' Model Post Office Sesquicentennial International Exposition' in killers. Addressed to Enumclaw WA [20 miles east of Tacoma].

Comments Three 1926 domestic routes did not connect to the transcontinental route- CAM-13, CAM-15 and CAM-10. No postal reference has been found identifying combination rates applicable to air mail from these three routes. See next page for source of data in tabulation at left. Our interpretation of this data indicates combination air mail originating on not-connected routes would go by train [egg Washington-NY, and be forwarded by air from NY. However, there are known instances when mail from Florida, intended to go west via the Transcontintental would go via Chicago rather than NY. If mail from CAM-10 went via Chicago rather than NY, one less zone would be involved and the rate could vary from CAM-13 / 15 mail. Thorough discussion of the rate possibilitie sapplying to the did not connect routes would involve a short chapter in a handbook.