Gibson build some J200's with "tune-o-matic" bridges set into the mustache bridge:
http://www.tfoa.eu/the_store/index.p...oduct_id=33917
If I read correctly, they only did this in 1961/62. I'll let you speculate as to why they abandoned this method.
In their quest to be innovative (and avoid rework and warranty repairs) Gibson also built some acoustics with adjustable bridges. Any model with ADJ on the label originally had this bridge with a ceramic saddle that could be raised or lowered. They don't use this anymore either.
https://www.google.com/search?q=Gibs...w=1024&bih=683
Many people have converted these instruments to fixed bridge and in most cases, it didn't reduce the value of the guitar at all.