Identify Makers mark on Tornsiter

[Figie]

Hello everyone! I need to your help to indentify makers mark on a leather belt. MARG?? Heilbronn 1937 E37. This was stamped into the right belt of the M39 tornister. And you can find another stamp which is: 17.E/J.R.19. II.
This tornister was made by Max Müller, Nürnberg in 1940

Many thanks for your help!

[BlackCat1982]

Well known leatherwork maker for Tornister, riemen etc: Marquardt of Heilbronn .

[Figie]

Oh, Yes! Thank you!