More playing with screen shots showed me that the dilithium crystal chamber appears to do what the RAC phasers do, but it also winks on and off at about 0.5 Hz which I'd never noticed before.
Not much of anything else new showed up and nothing to see when fired.
Here's all that I could pull. The one Uhura uses does the same wink out of the dilithium crystal which is really the only new aspect I found. New for me at least.
Some shots to register the color and the holster shape.
This gives a good look at the angle of the grip bottom.
And the winking shots. Now you see it.Now you don't.Best view of the side.Best view of the top.
It's a shame that this phaser style was not used more. Do the indicator lights on the P1 cycle like the TMP/TWOK P1? I can't recall seeing it sequence.
You can't see if it does in the only scene it gets fired. I guess only Richard knows what it did.I just checked for anything else when Saavik draws but nothing new.
I took a quick look over at trekcore for TNG S4E09 "Final Mission" and this phaser does not show any lights on in any of the screen caps. Did they do anything different to the prop besides adding weathering and a leather grip?
Here's a link to Richard's site regarding this phaser. It has information regarding the blinking lights Scott is talking about and information on the four "settings" lights. (adding for extra information) http://www.racprops.com/issue6/Phaser3/