Here is joint I have not encountered yet. I suppose they are technically dovetails, but I think the construction looks more like tails of fish.
Paul Windle-Taylor of Brittany, France, discovered them at the back of the bottom drawer of an ornate carved Breton armoire made in about 1908 as wedding present by the father of the bride.
“As with much of this rural working, the external work is of fine quality but the intrinsic build is massive,” Paul wrote. “I was struck by the assumed bomb-proofness of the work. This is one drawer back that will not come off!”
What is awesome about this crazy joint is that it does not require glue to stay together. C’est bon!
— Christopher Schwarz