Good condition, operation confirmed. SONY KPX-1

This item was found in my grandmother's closet.

The accessories are as follows, to the best of my knowledge:
- Main unit (color deterioration unknown, handle has rust)
- Main unit box (significant damage due to age)
- Microphone (operation tested)
- Power cable (used for main unit operation check, appears to be the original cable as it has a SONY logo)
- Styrofoam for securing (bottom part of main unit may be missing?)
- Instruction manual (completeness unknown)
- Cassette tape: 21 Enka Best Hits 16 (played for about 1 minute)
- Karaoke Hit Lyrics Collection MC-21~20 II
- Original service window bookmark (like a phone book?)
- Sony Acoustic Products warranty card (store name included, name not filled in)
- Original batteries possibly included with the main unit (only one photographed, has leaked)

The condition is good, and it is believed to be complete.
Operation checks include tape playback (about 1 minute from the beginning and rewinding), all switches lighting up, microphone test, etc. (operation with batteries was not tested).

I searched flea market apps and similar listings, but found no comparable transactions, so I have set this up as an auction.

Although the price is high, if there is someone who wants it, please feel free to suggest a price in the comments.
For shipping, I will use a separate cardboard box with cushioning material to protect the original product box as much as possible.