Abstract: A one shot use, nonreusable or nonrefillable writing implement has a writing insert with a front end writing tip and a rear end projection for perforating the closure of a writing liquid (india ink etc.) reservoir; a two part cap has an axially slidable end piece with a sleevelike extension with two beads and a cap sleeve for locking the cap in two positions; in one position the writing insert is kept from the closure and in the other one the closure is perforated, a spacer ring holds normally the end piece is held in pristine state indicating position corresponding to the first latch position on removal of the spacer ring, the end piece upon being pushed towards the cap sleeve permitting establishing the second position wherein the second one of the beads latches.