Made by Matsushita (Panasonic). Mazda Part# GJ6E-79-APX. The CA-DM4290F is the faceplate / eject button.

MD Player

• Total Harmonic Distortion Less than 0.2%
• Signal to Noise Ratio More than 65dB (IHF-A)
• Channel Separation More than 52dB (IHF-A)

Optical Pickup: L1BBC0000001
ATRAC IC: C1BB00000680 (most likely a rebranded Sony CXD unit)

The part is now discontinued but cost dealerships $299.46 with an MSRP of $499.95

Panasonic CX-BM4290F Service Manual

CA-DM4290F Service Manual