It is a a top loading CD player using Sony pro mechanics. High-end Burr-Brown PCM1738 with tube output (6N16B, can be replaced with 5670 ot WE369A) and R core transformers. Aluminum alloy case with balanced output as well. There is also a commemorative edition with 12AU7 tubes.
CD-23 was a classic Bitstream DAC7-based player which I used to have. The CD-23's sound was smooth albeit a bit laid back. A very good disc spinner especially with its Philips CDM9 mechanism considered by some the very best Philips mechanic ever produced.
http://www.badahi-fi.com/