It could be the name of the people who carried them, I was also wondering if it was a leatherworker's name. Either way, pretty neat.I'm guessing, Gebrig, but the first three might be the names of the officers and the issue dates. The last one could be too, but no first name, so...?
As far as the eagles, I couldn't say.
One could check records of units in the area for names.
I wonder if there is any database of all the German holster makers? If they were general issue and not made by a small company that would almost guarantee the names were of the people who carried the pieces.