PARKER Jack knife safety # 91 , button filler ,smooth sterling silver overlay with Heath hallmark ; PARKER Jack Kife safety # 92 button filler , sterling silver hand engraved overlay with Heath hallmark; Identical PARKER with some diferences on the engraved overlay and without clip ; PARKER Jack Knife , button filler , sterling silver filigree ; PARKER identical to the last one with some diferences on the filigree and without clip ;PARKER Jack Knife button filler identical to the last two pens but with diferences on the filigree overlay; All pens , c. 1917-1925.