https://www.gamespot.com/articles/new-ps4-pro-model-celebrates-500-million-playstati/1100-6461055/

Sony has reached an impressive milestone: in the 24 years since the original PlayStation launched in Japan in December of 1994, the company has sold over 500 million PlayStation consoles (525.3 million, to be exact). To celebrate, Sony's releasing the PS4 Pro 500 Million Limited Edition. It's a new translucent dark blue version of the console that will be limited to 50,000 units worldwide. It will be available on August 24.

The PS4 Pro 500 Million Limited Edition comes with a DualShock 4 controller with the same translucent blue shell, a 2TB hard drive, vertical stand, and PlayStation Camera. The front of each system will have a commemorative copper plate with its unique serial number etched on it. Some will have "extra special" serial numbers like 09995 (U.S. Launch Date of the original PlayStation: September 9th, 1995), 01115 (U.S. launch date of PS4: November 15, 2013) and 01013 (U.S. launch date of PS VR: October 13, 2016). It will sell for $500 / £450.