WW1 trench knife or combat knife or Grabendolch marked Gottlieb Hammesfahr, Solingen-Foche

This is a beautiful example of a WW1 trench knife or combat knife or Grabendolch. The knife is beautifully marked Gottlieb Hammesfahr, Solingen-Foche. The leather closing flap features the typical German button. The blade is marked with an unknown maker logo which could probably be identified. The knife is in very good condition and shows almost no wear or usage considering the age.