thin planchet 50c

enworb · November 22, 2012, 03:38:52 PM

My understanding is if it is a thinner planchet there would be less metal to 'fill out the die' and therefore the details wouldnt be struck as fully as normal.

Graham · November 22, 2012, 10:07:25 PM

Quote from: 'enworb' pid='3747' dateline='1353560932'My understanding is if it is a thinner planchet there would be less metal to 'fill out the die' and therefore the details wouldnt be struck as fully as normal.

Sorry, I misunderstood.
Could the planchet have actually been meant for another country?

Ozcoins · November 22, 2012, 10:33:51 PM

Quote from: 'Graham' pid='3760' dateline='1353584245'
Quote from: 'enworb' pid='3747' dateline='1353560932'My understanding is if it is a thinner planchet there would be less metal to 'fill out the die' and therefore the details wouldnt be struck as fully as normal.
Sorry, I misunderstood.
Could the planchet have actually been meant for another country?

I dont think so. It seemed pretty normal, other than being thin.
I dont have it with me right now, so I cant measure the diameter right now.

Ozcoins · November 23, 2012, 09:44:44 PM

Some pictures of the thin coin being measured, and a normal coin being measured.

Ozcoins · November 28, 2012, 08:37:33 AM

Does anyone else have any thinner than normal decimal coins?
I am interested to see how they compare to this one -particularly the weakly struck idea.
Also does anyone know how common our rare these are?
I will try to get some more pictures up too.

purplepennyhunter · November 28, 2012, 04:32:40 PM

This Aussie $2 is struck on an underweight planchet. The planchet was thinner hence the weakness on both sides of the coin.

Have we seen photos in this thread yet?

trout · November 28, 2012, 05:07:29 PM

Quote from: 'purplepennyhunter' pid='4065' dateline='1354082560'This Aussie $2 is struck on an underweight planchet. The planchet was thinner hence the weakness on both sides of the coin.

Have we seen photos in this thread yet?

None have graced my "Peeps" in this thread yet

accumulator · November 28, 2012, 05:13:39 PM

Yeah a pic of the OP's coin would be good.

Ozcoins · November 29, 2012, 11:04:18 AM

Here is a picture cropped from a picture I have of it on the scales.
I also measured the diameter today and it matches with a normal coin.
I have also added pictures of the thin coin on the scales, along with a normal coin on the scales.

Ozcoins · November 29, 2012, 10:29:11 PM

Thanks for the link PP.
Comparing the $2 to this 50c, there is a much bigger difference in between the weight the $2 coin should be and what it ended up compared to this 50c.

$2 4.1g vs 6.6g = 62%
50c 13.6g vs 15.5g = 88%

I think that being closer to the correct weight than the $2 example might explain why the $2 is a weak strike, while this 50c looks pretty normal.

purplepennyhunter · November 30, 2012, 06:45:37 AM

It's pretty hard to tell form the pics but am I seeing some weakness in the lettering close to the rim. If the coin isn't that far underweight that might be all you'll see.

Weakness will first be found around the edge. Take a look at this NZ error while a different type of error you can see where the weakness is most prominent and where the strength in the strike lies. I guess this would be 50% thickness as it's a split planchet.

Ozcoins · November 30, 2012, 08:33:11 AM

More excellent info!
I think there might be a little weakness, but between the wear and tear and a bit of rolling machine damage it its a little hard for me to be sure.
I will take a closer look.
Thanks again.

Russ e · November 30, 2012, 09:23:03 AM

i thought i had noticed some lighter 50c pieces in my travels but never weighed any to check them, but the did have rims that looked much the same as those here., low almost non existent rims, but still reasonable detail.
could they be a fake?

Ozcoins · November 30, 2012, 01:27:27 PM

I think it is unlikely that this (or any other 50c) is fake.
They are not worth enough to bother.
I also think that if someone got the design done well enough that you can not pick it, they would get the thickness right too.

emu666 · November 30, 2012, 05:55:41 PM

Quote from: 'Ozcoins' pid='4163' dateline='1354244247'I think it is unlikely that this (or any other 50c) is fake.
They are not worth enough to bother.
I also think that if someone got the design done well enough that you can not pick it, they would get the thickness right too.

You may be surprised. I have seen a fake 5c.