It is for a Sony LDP 1500
The Sony LDP 1500 is the same laserdisc player used in the arcade Dragon's Lair II and Space Ace arcade units. A rare find for people looking to build, restore, or just have a backup player for the vintage arcade units for Dragon's Lair, Space Ace, etc. You can't use any old laserdisc player for Dragon's Lair, but I'm sure most of you know that already.
I thought I'd give the heads up to the auction