it may be a Kohler or at least have same design try this
It may be a Kohler or at least have the same design. Try this :
1 Hold on to the handle while turning the handle base counterclockwise by hand or with a strap wrench, taking care to protect the finish.
2 Remove any remaining components to expose the valve. Set all parts aside for re-use.
3 The valve can now be replaced or other repairs made.
4 Reassemble handle parts in reverse order.