This is the result of having a longcase clock standing on heated floor tiles. The owners moved to a new house with floor heating and one day the front of the longcase clock trunk split in a nasty way. You can see the wood behind the veneer has bended by the dry air and split. Its from a grand 18th century mahogany longcase clock made in Liverpool circa 1775 with beautifull bookmatched mahogany veneer. Only a few pieces of veneer are missing, but how do I get the planks flat again I really don't know. I will post a picture of the whole clock tomorrow.