jimgalli
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The only one I've ever seen, and most certainly long out of production. You can still find a Cambo to Sinar adapter board at Calumet, but it's $269!
This was made when they were still selling the big Calumet 8X10 Green Monster series. But Deardorff boards also fit this adapter perfectly.
A rare accessory! You may never see another. $85 shipped in USA.