User Summary
SG Fighter (SV-401)
Jet fighter style joystick with large thumb (Fire A), and index (Fire B) buttons, as well as two smaller buttons on the left of the thumb button; Start (right) and Fire C (left).
To the right a Slow-switch is found and on the joystick base an autofire switch.
Officially designed for SEGA Video Game System, and SEGA 16-bit Mega Drive, but is compatible with Commodore computers (C64/128, VIC-20, Amiga), Atari computers, and similar.

Jet Fighter (SV-126)
The Atari/Commodore version, had a different button setup but else practically the same.
Left of the thumb fire button the two buttons exchanged to switches which activated auto-fire mode (left) and adjusted frequency (right). On the right side there was a switch to change between Atari (incl. Commodore) and CPC interface.
As Auto-Fire is moved to the stick head, there is nothing on the base.

M-5 (SV-201)
The PC version of the Fighter series, but did not share the Fighter lastname.
The connector was different, as for PC (D15 Male).
On the base has two wheels; one for auto-fire (right) and one for calibration (left).
On the stick there are switches as on the Jet Fighter, but the setup is auto-fire 1 (left) and Auto-fire 2 (right) to the left of the thumb fire button, and to the right a swrich for N and R.
Stick was white with red "lined" letters on base.

Ni-5 (SV-301)
NES edition of the stick. The stick head had two buttons for Start (right) and Select (left), and a switch to the right for Auto-fire - frequency was adjusted on a wheel on the base.
As for design, it was similar to the PC edition; Nintendo-white with the model name Ni-5 in letters made from red horizontal lines.

All above share the same Patent no.