Another attempt by those looking to deceive collectors, thank you for posting this FB.
And the poster in other forum ignored the full answer. I would tell more, the hand which add the Mitgliedsnummer, never knows and wrote Suettrlin. The men who can write it, write the digits in other way too
my Skype: warrelics
The RZM stamp is a joke. The fakers seem to think that marking things with RZM will fool. In this case, it is a blinking warning light.
LIFE'S LOSERS NEVER LEARN FROM THE ERROR OF THEIR WAYS.
This sort of tag has been faked for forty and more years in various forms.