1975 United States Proof Set with Silver Ike dollar question

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amnight
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1975 United States Proof Set with Silver Ike dollar question

Post by amnight » Thu Aug 29, 2013 4:50 pm

I wanted to know if it is normal for a 1975 U.S. Proof Set to contain a silver bicentennial Ike dollar?

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Re: 1975 United States Proof Set with Silver Ike dollar ques

Post by SteveP » Thu Aug 29, 2013 5:26 pm

They should contain a 76 T1 clad proof, not a silver proof.
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Re: 1975 United States Proof Set with Silver Ike dollar ques

Post by amnight » Thu Aug 29, 2013 6:19 pm

Here is a picture of the coin with comparison shots of 1975 and 1976 set holders. If more information is needed, let me know and I will post. Thanks!
ike dollar mirror 006.JPG
Mirror without cameo
1976s proof set.JPG
1976 proof set
Attachments
1975s proof set.JPG
1975 Proof Set

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AndyO
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Re: 1975 United States Proof Set with Silver Ike dollar ques

Post by AndyO » Thu Aug 29, 2013 10:01 pm

I'd be hard pressed to believe you have a silver proof in a 75 proof set. Stranger things have happened, but it would be a VERY long shot, especially since none have been discovered as such to date.

The only way to know for sure is to check the reeded edge (besides weight).
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Re: 1975 United States Proof Set with Silver Ike dollar ques

Post by amnight » Fri Aug 30, 2013 9:30 am

I have read that you cannot determine if a this type of coin is silver by looking at the reeded edge because it is only 40% silver and not 90% silver. Here is a picture of a 40% and 90% side by side. As you can see there looks to be a copper band around the 40% coin which is a 1968 half dollar. The 90% 1962 coin shows gray and there is no sign of copper. Here is a side by side picture of both coins.
comparison 19681962.jpg
1962 on top and 1968 on bottom
I've also tried the tissue test and you can't really tell if it is silver because of the plastic case.

So I think it comes down to weight. I made an Excel Spreadsheet to figure out what the weights should be for both silver coin and clad coin weights, here is what I came up with for the 1976 set: The coin and case weight is 126.8grams. I added up the coin weights which came out to 50.07grams(so the case weight should be 76.73grams). I then multiplied 50.07g by 4% for tolerance and that came out to 2.00grams of tolerance. I added coin weight and tolerance equaling 52.07grams, then added that to the case weight 76.73grams, that came out to 128.8grams.

I did an average of case weights 1976=76.73grams, 1975=77.62grams, that came out to 77.18grams(for the 1975 set I did the same thing I did for the 1976 only swapping out Ike dollar weights for each set: silver and clad, and used the 1975 case weight).

Adding up the average case weight(77.18grams) plus higher coin weight tolerances for the 1976 set(52.074grams) equaling: 129.254grams.

To sum it all up: 1975 coin and case weight: 129.6grams. The 1976 set is not within maximum tolerances for the averaged weight(77.18grams) calculations 129.254grams, and 128.8grams for the total weight (including the 4% tolerance) of the 1976 set.

There is 2.8grams difference between the two sets.

I'm sorry this may be confusing and my calculations may be wrong, but this is the only way i could come up with to tell the difference between the two sets.

I have also read that a silver coin may have a shiny reflective finish.

Thank you both for responding!

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AndyO
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Re: 1975 United States Proof Set with Silver Ike dollar ques

Post by AndyO » Fri Aug 30, 2013 1:04 pm

You have to compare a copper-nickel clad Ike against a silver clad Ike edge to edge. Use a clad proof and a silver proof Ike side by side (meaning brand spanking new/untouched) and the the difference will be obvious.

As for your weight, I would guarantee you that the variance in case weight coupled with coin variance is going to easily throw off your measurements. Plastic injection molding and trimming in the 1970's (let alone now) was just not super precise on something of that size. Heck, it could be the difference in glue holding the halves.
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Re: 1975 United States Proof Set with Silver Ike dollar ques

Post by amnight » Sat Aug 31, 2013 6:07 pm

Andy, I don't have any silver clad Ikes to compare. I do plan on having the coin sent in to be examined. Do you know of any other ways of determining if this coin is 40% silver other than sending it in? I took some pictures of the obverse and reverse of the rims so maybe you could get a better idea of what I have. Maybe you might see something that I don't since you did see a UDU on a coin I had posted. :lol: Thanks for the help and I know it is a long shot! :D
obv.jpg
obv closeup.jpg
rev.jpg
rev closeup.jpg
EDIT: Also notice the 1975 does not have a frosted cameo bust. I don't know if this matters, but thought it was worth mentioning.

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Re: 1975 United States Proof Set with Silver Ike dollar ques

Post by AndyO » Sat Aug 31, 2013 10:46 pm

The overall look from all your pictures, as well as the rim of the most recent pictures scream normal clad proof to me. That copperish color you see on the rim is just that - copper.

Clad proofs of that year and earlier are notorious for not having even remotely decent cameo effects on the devices. Silver Ike proofs just have a more bright/lustrous look, even when they aren't CAM or DCAM. Believe me, I know. It took me MANY years to find my proof 1975 set coin with good DCAM qualities that was truly PF69DCAM worthy. This issue in DCAM is a true and VERY over looked rarity. Almost all in TPG holders are over-graded. True DCAM 73 and 74 clad proof are even tougher.

If you're that convinced about this coin, I would suggest getting another 1975 proof set since the are cheap and cracking out the coins for comparison. You'll save a lot of money and effort.
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Re: 1975 United States Proof Set with Silver Ike dollar ques

Post by amnight » Sat Aug 31, 2013 10:57 pm

Thanks for the advice Andy. I appreciate it very much!

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