Each is 7/8" and these 13 are among the 22 we know of in the series. At top featuring yellow rim accent is "Belgium-King Albert." Next with blue, white and red rim are four from "England" and four from "France." Names in order are French, Maude, Plumer, Robertson, Nivelle, Pau, Petain, Sarrail. In the bottom row with red, white and blue USA rims are Bell, Liggett, Mann, Sibert. Some of the England and France buttons have noticeable stain primarily showing on the white circle. These are VG to Fine while the others are mostly VF to Exc. Also see Marshal Foch U.S.A. visit button for Yale/Princeton football game #618.