Stephan98k
aka 8x57IS
Unit marking
By the Gortz and Bryans book, that unit mark designates an infantry regiment and not a Jager detachment.
The designations were modified in the Weimar era.
Bruce, I have two questions that are important.

Maybe my eyes are deceiving me, I'm not sure. The number "4" looks different. Was this number stamped at the factory or added later?

The unit should be 10th (Saxon) Infantry Regiment and the weapon number was 37. Does Gortz and Bryans's book explain why some weapon numbers have a dot stamped after the number and others don't?