Wrong on the missing ball links. That is a first generation Heli-Boy which did not yet have bell mixers. Collective pitch with direct Hiller flybar control. Also two piece brass flybar weights. Very stable, smooth flying heli.
Bell mixers later became an option and were included in Gen 2 kits. Made the Heli-Boy the first insanely aerobatic RC helicopter. Later flybar weights resembled elongated wheel collars.
I still have an original NIB Heli-Boy kit.
Now, back to you boys bashing each other.