Silver brooch with interesting markings

[mayjunejuly]

I have a large silver bird brooch with fresh water pearls. Online, I found the following info:
- Same brooch has been sold in the UK
- Different brooch, from the same maker, is being sold in Denmark
So, my guess is that the maker was European.

The markings are the following:

1) Pictorial mark:


2) Old symbols + numbers mark:

Looks like omega? + alchemy symbol for bismuth? + 82
What could this mean?

My brooch:
Brooch 1, front:

Brooch 1, back:


Brooch from a Danish seller, (admin edit - see Posting Requirements ):
Brooch 2, front:

Brooch 2, back:

[mayjunejuly]

I think I am getting closer: This is a Greek brooch? The second mark is a workshop mark?