Hallmarks On German Porcelain Has Anyone Ever Heard Of Hartglanz Silver. Received Pieces From An Old German Woman. Not Much Info Online.?

Has anyone ever heard of Hartglanz silver. Received pieces from an old german woman. Not much info online.? - hallmarks on german porcelain

The parts are valuable. Marked with a small label with the number 90 next door. Then the word hartglanz ... Can not find anything online, manufacturer or brand logo on it. More regrets not through the field to the woman handed over to me before his death. I know you were in your mother, then they are very old. The family emigrated to the United States shortly after World War II. Or tell me in the right direction.