From the organization known to us as

"that other lodge": Oft Unseen: Art from the Lodge and Other Secret Societies (via Coudal Partners).

Note that they need a proofreader for their URL: "exhibihitions."

The Confederation of Royal Stet Lodges Seal

For reference only:

For Maury, part three

For Maury, part two

For Maury

An interim logo created at the Official Seal Generator: