P-08 Markings Help

[noweyk]

1915 Marked over chamber.

1 M.G.K. R. Jag 13.69 on front strap

Numbers match on all but two toggle pieces marked S/42

Any help would be appreciated.

[JoeW]

Looks to be weapon 69 inventoried to the 1st Machine Gewehr Kompanie (Machine Gun Company) of the Reserve Jaeger Regiment 13.