This is a Sanwa Flash Clone Joystick. It is fully optical and has no switches that click. It is silent. I have modified this one with a Sanwa square gate and Sanwa JLF Spring, Shaft, and all parts possible that can come off of a Sanwa JLF. The mount is a standard JLF mount. This is plug and play with chtulu boards. The action is very smooth and precise. These are very rare. With the JLF parts and the ASCII PCB, this is as close to a Sanwa Flash (almost discernible) that you can get.
Asking $55 shipped.