New vintage silver bullet necklace

New vintage «silver bullet » necklace Rare find! This is not a real bullet or shell casing. These military design pieces used to be popular in the 1970s! Some were pens or roach clips in disguise. 11.5 “ chain flat: love these chains because they are strong. forget what they are called! 3” pendant: supposed to open by turning the bottom or top half, but I can’t open it. It turns, but never opens. ☹️ so it may be a pen or a hidey hole or nothing. New. Vintage c. 1970s. Steel chain and pendant. Great weight and feel!