A double block of soap Sunlicht, perhaps the most famous brand of soap. This one with RM (Reichs mark) 20000 guaranty for the original quality

SUNLICHT GESELLSCHAFT A.G. MANNHEIM BERLIN and the written guaranty indicate the soap is fabricated mid 30's. The nazi's claimed the fats and oils from the margerine and soapfactories, so the guaranty must be before that period. The factory in Berlin moved elsewhere during the war because of the many bombardments