Up for sale flass part from T.mi 4531 - Topfminen 43. 

This extra rare antitank mines were made without metal parts,

the housing were made from presstof - model 4531

 -  lignit (a mixture of wood flour with coal tar) - model 4531 A  ,

mixture of sawduse and resin - nodel 4531 B

or from clued cardboard plates - model 4531 C.

The glass part has very small cracks -  check the pics.