Strange 2600 Joystick

[Carey85]

I came across a joystick in a 2600 lot yesterday, unlike one I've ever seen before. It's identical to a CX40 joystick, aside from the fact that the orange paint around the base is slightly off, the action on the joystick is sloppy as opposed to a CX40 joystick, and the controller connector is slightly different, with the letters "AMP" on the connector. It's obvious that it's an aftermarket stick, but why go to such great heights to copy Atari's design. I've never come across one of these sticks in my years of collecting, so I was wondering if this particular stick is rare.

[ATARIPITBULL]

Did it look anything like one of these?