[GreenKeys] What is "Mr RTTY"?

[Jim Pruitt]

This auction has no actual description:
https://www.ebay.com/itm/273409726836

Any idea what "Mr Rtty" was and what else if anything might have been 
mad/sold?  Or is this someone's homebrew project?

Thank you.

Jim Pruitt
WA7DUY
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