coin id

[mesha]

I'v been asked to bid on this coin but I don't know this coin and how much does it worth, (gold 3.5 grams, 3 cm). any help please ? Where can I find additional details about it ?
thanks

[mesha]

I could not find any exact match on internet. Is it unique or it is just bad fake ?
HOW MUCH SHOULD I BID ?
Here are better images
Thanks

[mesha]

Can anyone tell me why I havn't got any answer yet ?????

[peterburrows60]

I would look under Venetian Republic - a gold ducat, perhaps.