Odd Sounding US Halves

Hello fellow coin roll hunters. I recently came across two odd halves while coin roll hunting. While searching, I do and edge search followed by a date/mint mark search and lastly a drop test onto the pile of coins. Right or wrong, that's how my wife and I search halves. Two of them recently found have a higher pitch sound when dropped. One is a 1979 plain and the other is a 1973 plain. We have found, in the past, two of those magician trick halves. Those had a lower dull hollow sound when dropped. I did try to separate these two most recent higher pitch halves by shaking them in a Tupperware dish much like I did with the other magician coins but to no avail. Does anyone know why these two would sound so much different then a regular half dollar? They both have a clad copper edge so they can't be silver. Thanks in advance.
Steve

 

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Perhaps they are on a thicker or thinner planchet? Have you weighed them?

 

The 1973 weighs: 9 grams or .3 ounces
The 1979 weighs: 9 grams or .3 ounces
I guess the next step would be to measure thickness?

 

That's certainly very light. Do they look more weakly struck than a typical half?

Welcome to CoinTalk!

 

They sound different from all that dropping and rattling around in Tupperware.

 

No, but I used a digital kitchen scale. Im betting its not as accurate as it needs to be for this purpose. thanks though.

 

A normal clad half should weigh 11.34oz. Those are pretty light.

 

Can you post pictures of then? Do they look different from other halves?

 

Should be .441oz or 12.5 g

 

90% Silver would be 12.5g but OPs coins are 73 and 79, so both clad, which is 11.34g

 

double post

 

Oh my fault, but i was really confused about your initial claim of 11.34oz. That would be a darn big coin

 

Admittedly the 1973 is kinda crap but it sounds exactly like the 1979

 

That 73 is enviromentally damaged. What is the thickness of the 79 compared to a normal half?

 

I don't have a caliper with me at home to measure thickness. It'll have to wait. Maybe these are just anomalies.

 

You can just do a side-by-side comparison for thickness.

 

I was gonna say that one or both could be "magician's coins", but I don't see any tell-tale seams in your pics...

 

Example from my collection -

 

I wonder how many of these thin planchet coins get put back in rolls - certainly not a 67! I have "heard" a few coins that have a strange pitch too. But, I've put them back in the roll after seeing the date "70-something". Oops!