The green plastic driver cover is earlier than the foam..so absolutely positively yours are not Fostex. Possibly Jensen, but more likely early Heppner.

What I am saying is your horns date from the late 60's before Fostex entered the US market.

Pano yours sound kinda like Jensen Rp-109?

http://usr.audioasylum.com/images/y2...eeter_1092.JPG