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CAM-2 combination cover with lots of features posted on last day of confusion rates. This piece makes it clear that there's a serious overlap - between the 'domestic rates' section of the AAMC and confusion.

Cover serviced by P.F. Robertson, APSA member #25. [Aero Philatelic Society of America was early name of American Air Mail Society.]

Dispatched by P.F. Robertson from AMF Elko to Peoria on Jan 31 1927. Through air mail, Elko-Peoria, required two zones on Transcontinental and CAM-2, Chicago-Peoria [20¢ franking for two zones and one route]. Day of posting Jan 31 1927, was last day of combination rates [RC-14]. AMF Elko postmarks usually seen on CAM-5 inaugural mail; other uses appear to be quite scarce; AMF Elko postmark [EKO 1] identified as being in use 1924-1927; this cover is a late usage 15¢ map stamp was used on last day of 'proper usage;' 10¢ per 1/2 oz rate on 1 Feb 1926 obsoleted it.

Illustration of similar AMF Rock Springs cover, from AAMC Fifth Edition, AMF Section, Volume Two, p 570