Used Leica 'Leitz' Series 8 Circular Polarizing Filter

This Leica 'Leitz' Series 8 Circular Polarizing Filter is a drop-in filter (no threads) designed for a variety of Leica lenses, including:

• Elmarit-R 24mm f/2.8
• PA-Curtagon-R 35mm f/4
• Telyt-R 250mm f/4
• Super-Angulon-R 21mm f/3.4
• Elmarit-R 180mm f/2.8
  
• Summilux-M 21mm f/1.4 ASPH

And a variety of others. It is also sometimes described as "Series VIII".

It is in very good condition and includes the original box and case.