Enamel brooch who is this?

[dins9187]

Really can't read the stamp.  Hoping some one might know the jewelry maker.  All I can see is OAN.  Thanks in advance for the help.

[1940fc]

Kinda looks like Roman to me.

[1940fc]

Maybe D`Orlan

[wastingtime101]

Hi @dins9187 .

Looks like GIOVANNI but the mark is somewhat messed up.

Do you agree @silverstatetreasureboxes ?

Example:

https://www.ebay.com/itm/204018009246

[silverstatetreasureboxes]

@wastingtime101 

I believe you are correct, same surface back as OPs, agree MM is messed up or worn..it happens..

 here's a close up.

[dins9187]

WOW thanks so much for the help!