Question about LW clasps

[Dimitris]

Hello
Does anybody knows if Zimmerman was making LW clasps marked 20

[Wijtman01]

as far as i know i have never read or seen a flight clasp with a number mark

[Gene]

Yes, Zimmermann made Schlachtflieger clasps and stamped the reverse of the pin with a 20

[Ludwig]

Hello
Does anybody knows if Zimmerman was making LW clasps marked 20

Yes, I once had an Aufklärer in silver, marked 20 on the inside of the pin.