Modernist Silver Brooch Maker ?

I have this modern looking sterling silver brooch and wondered could anyone recognise the part mark that's there in the photo.

 

After the 925 it looks like co then a dot and another symbol haven't been able to find out anything from the style.The green stone is maybe Agate ? size is almost 85 mm in length and weighs approx. 34 grams.

 

Can't help with stone or mark, but that is exactly the kind of pin I would have worn on my suit jacket back when my daily attire was "dress for success" instead of today's "just jeans." Lovely!

 

I wonder if that last part might be a thunderbird? Maybe Native American?

 

I can not help with the mark, but I will lay odds there is going to be more than a couple of members claiming they lost this pin & requesting that you please return it to them.

 

The last symbol looks kind of like a 'dollar' sign, but that can't be right?? A bit enlarged, with the first image inverted.....but doesn't really clear anything up TO ME anyway!!!!!

 

Thank you for all your replies will keep looking .

 

The stone could be a jasper or dyed chalcedony,but there is too much reflection in the photo to say anything except it is a green stone.

 

Chrysoprase, i.e. the green form of chalcedony. Same rock. As for the maker...dunno.

 

I wonder if it's Russian, CO:F
(No idea what that might stand for)
The last letter could be the Russian "f".
The high period could be half of a colon which I've seen on Russian stamps.

 

Badly hit german mark, crown at the end

 

LOVE IT !! .. Yes, I lost this yesterday .. please return it IMMEDIATELY !! , Joy.

 

Thanks for the replies will check out the crown mark and no I wont give it back finders keepers .