Looking to buy JSE Infinite Slope model 2

Howdy all!

My grandfather had a pair of JSE Infinite Slope model 2 speakers.  The were large, black lacquer, heavy and sounded really good.  I have tried the common sites such as ebay, amazon, craigslist, offerup, however, no success.  Ayone have suggestions on how I might find these speakers?
I owned a pair back in day.  Extremely dynamic speakers.  Good luck but I have only seen one pair for sale in the past 10 years and they were in horrible shape.