Here You are getting a New replacement laser pickup 

Warranty: 90 days

This is Repair/Replacement Unit. 

Marantz CD-16D CD-17DA CD-17 MK II III CD-19a CD Player Laser Pick up Pickup


Notes during the machine operation:
Some laser lens has a protective point, inclusive this optical pickup, this point is a measure for anti-static burn of a laser and keep its safety , as our clothes and hairare all static materials, you can open this protective point with an high-grade anti-static iron, if you use a common iron, it requires much special attention, first, if the iron has melted the tin-can temperature, do remember to unplug the iron supply, then go to open the laser lens protection point, this is to prevent laser lens from burning by static electricity iron.
I will use a marker pen to point out the solder bridge, where you need to de-solder (some models)