An interesting mystery. Don't forget that Forte's catalog used to be far more extensive than it was the past couple years. It's possible that Bergger asked that certain products be produced exclusively under their label.
Originally Posted by Ole
I'm emailing a friend with an old Forte catalog from the mid 90s to ask her to scan it and send it to me. If she does, I'll cross-ref the existing Bergger papers against what Forte used to offer circa 1994.
I believe that Forte started producing film & paper for Bergger in late-1995.