New Zealand better variety - is conservation an option?

I picked up a 1942 New Zealand 3 pence, one Diamond variety yesterday for a whopping $0.53. There is some crud growing in the middle of the date. Is conservation an option and if so, who/how?

Thanks

 

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Hey Joe! Have you ever tried 100% Acetone?
Also, crimp those staples flat.

 

Yeah I use acetone somewhat frequently but it never touches that blue/green crud.

and yes, I need to buy a new stapler.

 

Okay, I've seen guys post about a product called "Verdi-Care". It's expensive but it might take care of that little spot. Then again, it's very minor and I would just let it go.

 

I'm not familiar with the variety. Is the diamond to the left of the date?

 

The normal production for this year has a Diamond on each side of the date. The more rare variety only has the one Diamond, as shown.

 

Ordered. We’ll try it when it arrives.

 

I don't clean my coins, even the more rough the coin might be.
Also, can you help me about the "diamonds". When did they first start using them?
Back to your 1942 3d coin, is the small bump to the left of the deck the diamond you referenced? My father left his coin collection to my brother and me. One of the coins I got was a 1941 3d (Pence) George VI. He got it during WWII while he was in the South Pacific.

 

Yes, the diamond is the bump to the left of the date. Normally would be one on both sides.

 

Looks like a nice coin and worth some bucks. Main thing is just to be careful with your clea... conservation. Te big no-no is rubbing/scrubbing or using any abrasive agents. Solvents aren't going to hurt your coins. This is a 50% silver coin and they can be tricky. I would first give it an overnighter in some acetone...glass container and close the top... followed by a hot water rinse and a final distilled water rinse. From there, there are several routes...

 

Other than acetone I would NOT try any new-to-you product on any kind of nicer coin.

If this is a nicer coin then either send it to a service like NCG has OR get a whole bunch of the common variety coins to test on the metal first.

Don't make your nice coin the guinea pig.

IMO it's perfectly fine to remove a surface contaminant ('wash' the coin) vs. anything more aggressive intended to 'improve' it above it's baseline or nature.

 

Kind of depends on how you define 'wash'... as long as you are using pure solvents and don't rub or scrub, I agree

 

100 percent pure acetone and distilled water. No additives, no tap water.

 

Tap water isn't that bad in most of the US, but a final distilled water rinse is always a good thing.

 

Well that worked pretty well. Before and after.

 

How about the spot on his head...