Please!!!!! Help me authenticate this brooch

[Kaya7]

Please help! I found this brooch but I am not sure if it is not fake.
https://www.vintageheirloom.com/shop/vintage-chanel-jumbo-cc-brooch/?v=13dd621f2711

 

[JetSetGo!]

Please post in our Chanel Authentication thread.
Hopefully there's someone there who can do jewelry or direct you the the right place.

http://forum.purseblog.com/threads/...-use-format-outlined-in-1st-2nd-posts.937412/

There are instructions on the first page on how to post your request. Good luck!