Two First War Pair of Austrian Regimental Badges

First badge is silver gilt with blue enamels, unmarked, 20 mm x 35 mm, vertical pinback; the second badge has a two-piece construction, silver gilt with blue enamels, hallmarked and maker marked "K-S" on the reverse, 24.8 mm x 35.5 mm, vertical pinback. Both with intact enamels, light contact, near extremely fine.