Bert wrote
I have some doubts, that the mine on Your pic ist the "Topfmine". Here a drawing and two pics of the "Topfmine A 4531" mine (source: Waffen-Arsenal Band 164 "Deutsche Landminen 1935 - 1945" by Wolfgang Fleischer.) for comparing. But I don´t know what mine it could be.
Thanks for your answers....I din`t had can find any information and/or image of Dutch T40 mine on the net...so i can't comment...ROLAND1369 wrote
My best guess is that it is a modified Dutch T 40 prewar mine many of which were used by the Germans.
Regards
Sturm78