Just been talking to Wim Saris ref leather markings and decided to set up a sticky for information. You see on a lot of leather belts the RZM logo with L2/xxx with a number (xxx). From Wim L2 standing for Lederzeugfabriken followed by the manufacturers number. If you know of any of these please note below and I will keep a list of numbers for use to reference.

RZM L2/2433 - A Hermeneit/Hamburg