I'd like to add some info today
I screen-capped some of that video with Steve, and it appears the Vader saber he owns (owned)? is one of the stunt or promo sabers made for Vader. There MIGHT be an MPP clamp with the lever facing forwards, a silver D ring block on the emitter, as well as the larger pommel and the black pommel circle...just like the Barbican, but this is more chrome and not matte finish.
The emitter and the tube are the same part I believe, there's a screw holding the emitter shoulder on the front of the saber, as well as a rectangular greeblie. The Tank Antenna has a step where it enters the saber. There's six pieces of T track with screws at the corners too I think.
So, this probably wasn't used in ESB, but the blade source is still extremely intriguing.
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