Silver coin with Coat of Arms with a cross

Hello experts!

I am struggling with this one.

0.49g

17mm

Looks lika a coat of arms with a cross 

the only visible lettering is “ST”

tried weight+diameter search but  couldn't find. One side looks like Banate of Severin.

Any clue?

Thank you for any comment!

Geison

Geison

Hello experts!

I am struggling with this one.

 

0.49g

17mm

Looks lika a coat of arms with a cross 

the only visible lettering is “ST”

tried weight+diameter search but  couldn't find. One side looks like Banate of Severin.

 

Any clue?

Thank you for any comment!

 

Geison

 

Probably billon, not silver (coating falling of)

The dark spots could also be remnants of the original surface that didn't get altered by the cleaning.

My guess some Hungarian Quarting or Obol.

Thank you for all the help, after several hours searching,  I guess this is the coin:

N#25169