https://www.cnet.com/news/sony-unveils-translucent-ps4-pro-500-million-limited-edition-to-celebrate-sales/

Help Sony celebrate selling over 500 million PlayStation consoles by buying another one! The admittedly cool-looking translucent dark blue version of the PlayStation 4 Pro, the 500 Million Limited Edition, comes with matching DualShock 4 wireless controller, PlayStation Camera, Vertical Stand and mono headset. The console will be on sale from Aug. 24 and will cost $500.

The units will be serialized with a copper plaque on it, though it's hard to think of 50,000 units as a "limited" run. However, only a select few (an unknown number) will have special serial numbers commemorating special dates in PlayStation history. Examples include 09995 (Sept. 9th, 1995, US PlayStation launch), 01115 (Nov. 15, 2013, US PS4 launch) and 01013 (Oct. 13, 2016, US PS VR launch).