I can't see paying so much for any
prop—assuming I had such disposable money—when much finer mock-ups are available for much
less, and considering how difficult it would be to authenticate this prop. It's like people who pay exorbitant prices for an autograph; the whole point of an autograph is as a memento of having met someone. That's all the authentication needed, and the value of getting the autograph.
Authentic phaser? Maybe, but I'd leave it for someone else more desperate for a piece of TOS. I'd rather meet any of the actors still with us, get an autograph and tell them, "Thanks for creating an iconic character" (who may have handled a phaser prop).