Please advice on this Nova Constellatio

[ShinyShores]

I dug this constellatio today. I am wanting to get some buildup off to see if i can figure out which version it is. Are there any advisable methods for this type of copper coin. Or should it be left as is? The buildup does come off pretty easily with a small nail scratch, the large scratch is from my digging tool while retrieving Which was done before i knew what coin it was. Thanks for your advice!

 

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[Kray Gelder]

Wow! Terrific find! I can't offer you any advice, but congrats!

 

[Wildcat1750]

Nice find! I am wrestling with the same question myself...