The MPP have lots of variation.
I was planning to create a thread about as I did for the Kobold flashgun.
I have to select pictures and add some other photos then make the thread...
I have or had at least 3 of them, and saw other on photo, and checked at least:
-2 shroud variation, one and two steps (I owned both) but there is probably a third variation.
-2 sleeve and button variations, white and black, both can be together or not, I mean, black button and white sleeve for example.
-2 brand plaques at least with straight or curved 'R" and different letters, I owned only the standart most common straight "R" version (have two of them)
-flat or rounded screw heads on the black near the shroud
-narrow and large "B" hole versions
-number or no number under the shroud
-at least 4 clamp variations: -straight black-white (on internal face) bars,straight plain black bars, tapered plain black bars, tapered plain white bars, I think the tapered black-white and plain straight white bars probably exist, the "white" is raw aluminum, it's machined on bicolor versions.
There is another variation on clamps, I mean long lever bolts and short ones, leaving more room for bubble strip or less
-3 circles on black area of pommel, or plain black area.
-rounded or stepped buble holder entry
The correct ESB vader has:
-rounded bulb holder
-one step "thick" shroud (never seen in real, but it surely exists),re-painted, the retaining nut is different to MPP nut and all existing replicas too.
the closest shroud is actual parks replica, then the real one,"one step thin version"
-narrow "B" hole
-flat bolts on black area near shroud
-plain black tapered bars on clamp, narrow version
-3 circles on black area of pommel
Except the shroud, my vader is correct version for ESB lightsaber.
The anh has straight aluminum color bars, but I don't know if there are plain white or reversed black-white bars, aluminum color on outer side.
Seems the ANH has one step shroud, but I can't tell if thin or thick version, I can't tell more about other details, except telling it's a MPP...
Seems there is another MPP saber, using plain black straight bars, but I don't remember which one it was.
About bubbles, please take care, the only correct bubbles for a vader lightsaber are original and rebelscum replicas.
Other are too roughly made.
I am working on castings to make replicas myself and maybe try to sell some of them.