This is an original KMS (Korean Micro Switch) 303N with original "thin" black 50A grommet. There were three common variants of the 303N:
CWL-303N KMS - Korean Microswitch
CWL-303N JMS - Japanese Microswitch
CWJ-303A - For a brief period, the levers were labeled CWJ (Crown Joystick) instead of CWL (Crown Lever)
The 303N is now referred to as the 303K (Korean Mounting Plate) or standard 303.
The Samducks (Crown) 303 lever went through various changes in design.
The 303N was released in 2008 as a Tekken BR exclusive lever.
The previous "303" lever was referred to as the 303 G (green) where the letter referred to the color of the bat top 303O (orange) etc. This was the naming convention for most original Crown levers like the CWL302 and 305. The 303G model was upgraded in 2008 as an exclusive lever for Tekken 6.
In the same way, the 303N (which is assumed to mean "NEW") introduced the blue body 303 lever that would later have FJ and MJ variants.
