After some help on another forum thread, I have doen some research on the unit markings. I came across this website of german MG units (in german).
http://www.weltkriegsopfer.de/Verlus...eilen_113.html
as you can see there is only one possibility.
http://www.weltkriegsopfer.de/Inform...s_0_18511.html
Before I found the above website, these unit numbers kept bringing up the Alpine Corps and those numbers did jive...somewhat.
1. MG. 21. A. ..........but there is no Ss after the MG but still it's the closest I've found so far. Anyone have any other suggestions?
Ed