Synergistic Research A/C Master Coupler S/N 111

This is an early example of what became a legendary product for Synergistic Research. As you can see in the pics it's S/N 111, which likely means it's the 11th one ever made.

I marked it "Good" due to age alone. It looks fine, and more importantly, functions perfectly. 
The other auctions pictured sold for $300 this year.  eBay has a $360 example from June of this year.  All that said, I'm reasonable and open to offers.

I measure 5'

Please review pics and ask any questions you may have. 
Here's a review on this product: https://www.synergisticresearch.com/reference-ac-master-coupler/

Lastly, if you review my feedback you'll see the first record is from December of 2000.  Shocking even for me.  However, that should help establish these older cables are authentic and from when I was doing this stuff more heavily.