Here is a specialized piece of technological debris from the early 1990s:  a BNC harness cable from a Macintosh video card to the back of a large desktop publishing monitor.

This cable was made by RasterOps, who sold NuBus graphics cards and 21" CRT monitors.  Many of those were fixed frequency monitors, which required a specific set of horizontal and vertical refresh rates.  Newer monitors were multisync, which could adapt to multiple frequency sets, and which used standard cables. 

There are four BNC connectors on the monitor end of this cable: Red, Green, Blue, and Black (for sync).  The other end is DB15.  The length of the cable is six feet.  Unfortunately, I do not know the pinouts.  You may need to change them for your monitor and graphics card combination.

The pictures here are of the item you will receive.  I welcome questions from interested buyers.

I will make sure that it ships securely and promptly.   I offer a 30-day return privilege and free shipping to any U.S. zip code.