I think I have to disagree at some extent, gents. I agree that it is similar but I think the amount and shape of the paint chipping on the emitter face doesn't correlate with the V2 pics at SWCA. Also, the rings on the "grenade" body are not as clearly defined to be the V2 or a Yuma and the clamp lever is clearly that of a regular Graflex clamp; the V2 lever jets far down into the length of the pommel and no amount of angling the camera is going to cut off nearly half-inch of extra lever.
In fact, watching the shot of him clamoring up the side of the sail barge, I'm pretty positive this is a resin casting like the ones with the hole in the bottom of the pommel. Most likely of the original Stunt hilts (quite probably the Shared if it kept the original clamp band). These are the best I can do right now, hopefully, someone who cares enough to bother screencap-ing the Blu-Ray editions, by better means than just Print-Screen, can get better, clearer frames to corroborate this.
View attachment 668687View attachment 668689View attachment 668691View attachment 668688View attachment 668690
Again, they're crap photos but I believe it's hollow and something like a key-ring clip (perhaps square) loops through the pommel and attaches itself to Hamill's belt (if he's wearing one under the vest) or just through the vest itself, judging by how much of the fabric is pulled by the clip into the bottom of the pommel. For practicality sake during filming, I believe this is why this can't be Yuma, or a V2; why both risk hurting your actor and damaging your 'hero' prop for the day?
All this gussing up to look like the V2 would therefore most likely be cosmetic work done to keep continuity between shots of the hilt.
In fact, we know there were casts made of the Stunts with the Graflex clamp and were hollow thanks to the Discoveries in the Archives video, as showcased here where it was next to one of the casts of the proper Hero/Yuma. It may not be the same one used in the sail barge shot but it would most likely be from the same mold that it was taken from.
http://www.therpf.com/attachment.php?attachmentid=605296&d=1431177492
Should this be true, which I have a strong feeling it is, this would have made the last 3-4 pages on the matter a complete waste of time on everyone's part.:lol
Is this video still available? ANY links?