By January 1910, the Jack-Knife line was off and running. It was available in plain black, black chased, and mottled hard rubber, with one or two gold bands. All models were available in a regular-sized and baby size, from models #20 to #25
At the same time, the Jack-Knife #15 and #45 could be ordered. The #15 had mother-of-pearl and/or abalone covered the barrel with gold-filled filigree on the cap, and #45 offered the same covered barrel, a smooth rubber cap, and a selection of faceted semi-precious stone, cabochon, or pearl imitation as a cap crown. Completed the JKS 1910 catalog the filigree models #14 and #16, sterling silver and rolled gold, respectively.