Coin Varity identification Polish 1971-MW 10Zt

There are two trial strikes on the 10Zt of breast feeding. One is KM 185 and the other is KM 186. One is nickle and the other is copper and nickle.

Does anyone know of a way to tell them apart aside from weighing them? Mine is already slabbed.

 

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Usually:
Read the label in the slab.

Or: Weigh an empty slab, then weigh the other, subtract-= net weight

 

I see your coin in my Krause. with a big price difference.
Copper-nickel - $15.00 Krause # Pr185
Nickel- $145 krause # PR186

What did you pay ?

 

Let see the photo of your whole slab.

 

Here is 1 from Ebay with a different reference # P-276A for copper-nickel. It might might be the same as yours ? What does you slab look like ?

 

Id say take another slab if you have one, and weigh it. Subtract the known weight of the coin inside, and you'd be pretty darn close.

 

145 for the nickel version? But no way to tell the difference?

 

Nickel is attracted to magnets, while copper nickel (like our 5¢) is not.

 

Great thought. At least through the plactic of the slab, and using a refigerator magnet, there is no response. I don't really know how pure the nickel is it the KM186

https://techiescientist.com/is-nickel-magnetic/

 

Let's see you whole slab label.

 

How much did you pay for your coin ?

 

I don't want to take a picture of it and it gives no useful information. Look it up on ANACS if you want to 7239527

 

This is the entry in Krause. I am not sure what those mintage numbers mean, if they are absolute numbers or need a multiuplier attached to it. If it is a straight number, there are only 500 Nickel examples that were minted.

 

Went to ANACS to verify. Shows no picture there.

 

How much did you pay for your coin ?

 

I puled it out of a sewer with a stickball bat and some bubble gum

 

Don't most pawn shops have that metal gun reader thing that determines what the metals are ??? Maybe try that ?

 

I believe the xrf gun needs to be in direct contact with the test sample. You have plastic and an air gap in the slab, so it isn't going to work without cracking it open

The OP has me on ignore because I'm rude. Since he won't see this, I hope he doesn't run down to the jewelry store to get it tested.

Also, I can't figure out why he doesn't show the label. If ANACS did the attribution correctly, it should say Nickel or cupronickel or the KM number If it doesn't have either of these, then ANACS failed at there job and phone call would be in order. Sounds like a simple solution to me.

 

You never had a 'rude' day in your life.

 

Ok, a little late to this party, but I do have a few things to add.

1. The only way (other than an XRF, which has been pointed out, needs to be in direct, or virtually direct contact with the surface of the coin) to distinguish the two is by weight.

2. The grading companies are terrible with the Polish Proba issues, and I have seen many mis-attributed or under-attributed on labels, across all 3 major TPGs.

3. The mintages in Krause are actually really poorly mis-transcribed from Kurpiewski's guide, which is itself not always 100% clear or correct. With the Probas, a very small number were struck in one metal (in this case pure nickel, and yes, it will be quite pure) for distribution to VIPs, senior mint employees / govt officials. A much larger number were then struck for sale to members of a subscription scheme that the mint ran for many years / for sale to members of the Polish Numismatic Society.

4. The precise mintage figures for this type are 51 200 (Cu-Ni), and 500 (Ni). In my experience, the 'limited' Proby generally come up in estate collections of the people who were presented them at the time / their immediate heirs, and generally in quantity. They are generally well-recorded as being from the limited strike, as these were produced specifically to be something special.

5. The likelihood of this being the Ni Proba is, in my opinion, very low, particularly if it was not specifically sold as such with some supporting documentation / an XRF report or weight.

Hope this adds some context to the discussion.