Yes, it is the diamond select toy, poor quality but my first.That looks like a toy that you repainted? With brush on paints?
Here's my 3D printed version. Try using rattlecan or airbrush paints instead to get a smoother finish. Also your colours are a bit off.
Try the official roddenberry build guild for colours: prp1766-star-trek-enterprise-phase-pistol-roddenberrycom
Right here! Star Trek Enterprise: Phase Pistol by grimmindustriesIt's all practice, and it's a good first attempt!
Kokanee, where did you get the 3D Files for yours? I have one of the diamond select TOS phasers, and I kind of want to do a phase pistol and a Disco phaser to have a set