After a long search for the (former) shaving head with ground knives (round tube, see customer images above) I find anything: simply by using Google "Brown 7091014" Search. Is there IMHO only individually for about 16 Eur. But the shear films differ, there are mW: * 360 complete (blue trimmer with normal shear holes) * 360 complete series5 (blue trimmer with flower-shaped shear holes) * Activator (with longitudinal slots)
Conclusion: For me, the combination of polished knife block + flower-shaped foil that which best shaved and holds about 2 years. Then get the shaving foil holes and plucks. The knife block lasts longer.
Happy rasoring.
Addendum: More information in the comments at the moment.