Your Mauser rifle cartridge pouches also bear the date, "1918" and have a mention of the unit, a "33rd Battalion" and the soldier's name tag: H. Schepanski. Perhaps "Kannonier H. Schepanski." Some research might turn up who that was? I'm sure someone familiar with the Kaiserreich or Wilhelmine WWI-era army or the post-WWI Reichswehr might be along to offer some insights... And who knows? Perhaps the name tag is from the Second World War?