Anyone know by whom these were provided? This one has a "M" stamped on one side. It has 42 teeth and seems the fit the BSA WM20 models.

Henk, you seem to have located some as well.

Thanks for your viewings.

email (option): unpob@yahoo.com

I have a few of these, these came from the Dutch AA who used M20 for many years.

Henk.

email (option): ahum@quicknet.nl