What is the "gray market"?

[Joy McNabb]

I have recently come across the term "gray market" pianos.  Would someone enlighten me on this term?
I am not a RPT, just a grand piano owner looking to sell my 30 yr old KG-2 Kawai that I purchased new, and hopefully buy a used GOOD grand in the Kawai, or Boston class with less age.  My grand had one pin slip
and I am wondering if this is a portent of things to come.

Joy McNabb
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