Few question about German markings

[Kometa]

Hello !
I’m happy that found this great forum here is my first post.
After revision of my grenade I found that some markings that I can’t read and decipher


First on cap of M43:
Looks like nxx ?


Second is Richard Rinker can ink stamp St ? never see something similar





Third I know only Do - donarit, all other stamp is mystery for me gwd/wgd/ bhg(or b) 40 Also cap is yellow under yellow I see blue, I read that germans 'joke' and repainted red cap at blue but blue at yellow never hear. May be someone know something about it.




Last cap from M24 by Richard Rinker WaA without digits (?) or I just can’t see them ?

 

[pysall]

nxx = Getzner, Mutter & Cie. Bludenz/Vorarlberg.
gwd = Hemmelskamp, Celluloid und Metallwarenfabrik, Bielefeld.
bhg = Pohlig A-G, Koeln-Zollstock.
bhb = Metallwerk Elektra GmBH, Gummersbach/Rhld.

 

[Kometa]

Many thank’s wdg is unknown ?