The gear is part of CD loader assembly in high-end CD player 3D Lab CD12. It uses Sony CD Drive (KSM2101ADM) so it can be compatible with other CD players too.
Faulty gear can be replaced with 3D printed one. Replacement gear was fully tested for correct operation.
cracked original gear 
replacement gear model 
gear position in assembly
Gear is compatible with 3D Lab CD12 Player.
However, it might work also with other devices based on Sony CD drive – just check your service manual.
Available for purchase in e-shop.
Impeccable service, 4 prototypes of gears rebuilt in a very short time and fully functional.
Thank you Martin!!!