Pascal,
The fuze you show looks like a variant of the M52 series U.S. Mortar fuze, and the anodizing finish on the fuze is more modern than the non-anodized WWII German fuzes, so I first question if your fuze is WWII German?
Yes, the markings look like Hebrew. In this day of allies and partnerships such as NATO etc., many countries use components and complete ammo from other countries, such as the UK 81mm mortar projos used by the U.S. during the first Gulf War, till they could manufacture their own copies. The U.S. currently has illuminating mortar ammo in 60mm, 81mm, and 120mm that use German mechanical time fuzes, as an example. When a country uses foreign components, they might add their own markings.