This will get it to you in a couple days versus a week. This is the dagger as seen in Mirror Mirror, a 1966 season 2 episode of Star Trek. It is one of the most famous episodes of the original series, and is remembered by fans more than 55 years after it aired.
Spock, Sulu, Chekov and others have all been turned into mean-spirited, Roman-saluting, power-usurping Machiavellians bent on annihilating planets and disciplining subordinates with pain-inducing agonizers. You know right away that Spock is evil because of the goatee. The Enterprise crew wears this knife on their hip as part of their alternate universe uniform (see attached screenshots from the episode). This is my own design from the ground up. I made it out of Prusament, an imported Czech material known for its rigidity and sheen, which gives a holographic 60s feel as seen in the original.
I maintained all the sharp lines and angles used by the original prop designers, who were far more limited in their production capacity in the 60s than they were in later iterations of Star Trek. The knife measures about a foot long. The holster has a belt hook that will let it hang at precisely the same height and angle as seen on the crew's hips. The knife seats firmly in the case, and will not come out accidentally.
Comic-con and other cosplay shows now have rules in place that forbid metal, functional weapons. This one meets their requirements, and can be worn into the convention center without issue. Designing this vintage prop was a particular thrill for me. I've designed props for television for more than 30 years, and still infrequently do so in my older age to keep the modeling skills sharp. This old one brought back memories of when the mechanical challenges were greater and the production means were simpler.