My stein..unique and mysterious

i have come across this beautiful stein[Dutch i think] with a unique shape and size with a metal lid on which it is written 92% K and a scale symbol is drawn. I was told that it is at least 70 years old…it is in great condition…it is unique brown shade[sienna brown] and dark blue design..on it…would like to know more about . On the bottom it is written-HK, HanelaCst[or l] and then under that is:- ^58. am curious to know about this piece of pottery…please any one has any idea..? can write to me