Olympus Pen lens to Leica M camera adapter
The Olympus Pen flange focal distance is 28.95mm, and the Leica M FFD is 27.8mm. This leaves about 1mm space for the adapter.
Unfortunately, the Pen mount is a tiny bit larger than the Leica M mount, and this adapter is impossible.
It is possible to make an adapter for closeups/macro purposes though, but demand for it will be quite low.
We don't plan to make it, therefore.