The following site indicates source for many instrument models.
It would seem that 765E & 765RE are Taiwanese.
I don`t know about 765RBE though.
Some comments at
http://www.wfg.woodwind.org/BBoard/read.html?id=7061
It seems odd that Pearl goes to so much trouble to not disclose country of manufacture in their website (unless I am mistaken).
http://www.pearlflutes.com/index.html
One thing that particularly annoys me is the huge hype attached to the "One-Piece Core-Bar", as follows:
"The One-Piece Core-Bar construction of all Pearl Flutes eliminates many of the wear and tear problems associated with traditionally constructed flutes, specifically in the areas of the high C key and the king post next to the F# key. Pearl has designed one rod that extends from high C through the king post resulting in an extremely reliable mechanism that plays more comfortable, stays in adjustment longer and is easier to service."
All this rave about precision and reliability, when it is very common on Pearl flutes to have very sloppy pivot tubes, and sloppiness where pivot rods go through posts. These contribute to a great deal of UN-reliability, and difficulty in achieve a reasonable adjustment. So does the use of rather firm pads in conjunction with both these faults and rather non-level tone holes.
I have no idea at which model level one stops seeing these problems, And there is no hint in the Pearl literature.
Because of these problems, I for one find myself charging quite a lot more for work I do on Pearl flutes, compared with say Yamaha.