Back Then there were many differnt people making dishes.
Its not any Andrew, Vertex was a New company then, the Guy who started Vertex was an old Harris employee, It might be a Harris Antenna.
BSB (as in British Satellite Broadcasting) near Southampton Had 2 from a company called DAI Dallas Antenna I(?) Re 1987.
Another Company was TIW (Toronto Iron Works)
NEC also made antennas till 1996/7'ish
Mitsubushi also made large antenna's,
FORD Aerospace Div, Yes an off shoot from FORM Motors.
To name a few from what I can remember.