1c Green, Coil (392). Two covers franked with guide line pairs, first dated Oct. 20, 1913 from Saginaw Mich. to Sherman Tex., second back to Saginaw with Oct. 23 date, both with same writing and second folded (indicating a self-addressed return envelope), first with some staple rust on back and right stamp a few toned perfs, still Very Fine and scarce pair of line pair covers, no doubt sent between philatelists, Mr. Curtis acquired these years apart and reunited them, one with 1992 P.F. certificate, Scott Retail for two used line pairs but that hardly does justice to fascinating pair of covers

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