Thank you Rob,
Interesting yet confusing too.
It seems these are mysterious as to when and where.
I may ebay it.
Thank you again for your time to reply.
Regards,
Paul

email (option): eastwood007@ntlworld.com

The flat glass rim or BO hood fits just the same on an MU42 shell, but the slot for the clip has to be modified if you want to fit a DU42 clip.

Ron

email (option): ronpier@talk21.com