I don't think it was made for TPM. The activation button and led bezels are different then any of the ones used on any of the props on that film.
There are pics of it on the set of rots. So, the prop was either made for sith or was made for aotc to replace a lost metal hero and then modified for sith.
Thanks for posting, I always like these prototype or never used props. I wonder why the blade emitter had 3 holes, none of the PQ sabers neglected to at least have a hole for the rod
There are a few (at least 1) on-set photos of this prop from ROTS. Apparently Obi was going to start the movie with this saber but lose it early on and replace it with the known EP3 saber but that idea was scrapped and instead he just always has the EP3 saber.
I believe those on-set photos were actually early costume/lighting/camera/whatever test photos, taken in Padme’s apartment set. There are photos of Christensen in the same set, probably taken around the same time.
I would guess that the prop department made the salt shaker saber just in case Lucas decided to transition from the TMP/AOTC style prop to the ANH style during ROTS. So, that prop, already being on hand, was used for the photo session. Of course, Kenobi ended up starting out in the film with the ANH-style saber.
Nice saber wish it saw some screen time. Is this particular prop all metal? Could have sworn I saw a resin bump/ indent near the emitter. Could just be light trick