Help with ID of modernist pin: DM & 3 hallmarks

[cmrblue]

This modernist pin has an openworked design with a church cupola sitting within a U-shape.
It is stamped with a DM, plus 3 hallmarks that appear to be a lion rampant, a tower (?)in a shield, and a script "S"
It has a Danish feel to it, but I cannot find these marks anywhere under England or the Netherlands, etc.