Weird weight for a gold coin - 9.57g - I need some help, please!

[stefffana]

Hi, everyone!

I have a question regarding the weight of gold coins with 100 Kina denomination, issued for Papua New Guinea's Government by Perth Mint and Franklin Mint between 1970 and 2000.

I have bought last year a beautiful coin 100 Kina 1991, 999, weighting 9.57g, made by Perth Mint. I couldn't find a specific page on Numista, Chards, NGCCoin or on another reputable sites, but the coin is real, with box, COA, no doubts about its authenticity.

I have checked about another 100 Kina coins issued in another years and I have found them strucked in .900 gold, having the same weight: 9.57g.

Why 9.57g? Why this weight? Why only for Papua New Guinea gold coins?

I have tried lots of calculations, thinking about divisions or multiples of known measuring units: Troy ounce, Ounce, Tola, Tael, Grain, but I couldn't find a logical answer.

Another weird thing is this fact: a smaller denomination of 10 Kina, issued in 1992 is 1/20oz. See https://en.numista.com/catalogue/pieces94824.html. Actually, I have also this coin, see pictures.

The newer 100 Kina coins has changed, having a logical weight of 7.8g, equivalent app 1/4oz. See https://en.numista.com/catalogue/pieces315172.html.

I will attach few links from Numista, also few pictures with my coin.

If someone can lighten me, I will say a big THANK YOU and I will offer a big HUG.

Many thanks for your time!

I do apologise if my obsession will became another people obsession.

Kindest regards

Stefan.

https://en.numista.com/catalogue/pieces64395.html

https://en.numista.com/catalogue/pieces96701.html

https://en.numista.com/catalogue/pieces85721.html

https://en.numista.com/catalogue/pieces73085.html

https://en.numista.com/catalogue/pieces99349.html

https://en.numista.com/catalogue/pieces99359.html

https://en.numista.com/catalogue/pieces99354.html

 

 

 

[HerefordBullyun]

Its Balanese lead sprayed with gold paint.

[stefffana]

Just now, HerefordBullyun said:

Its Balanese lead sprayed with gold paint.

You are allowed to go to the naughty page! 

The adults are busy on here.😊

[James32]

I'm still amazed it's more than 12ct 👀

[Dakaras]

It's a smashing looking coin! Maybe just one of those random things. 

[HerefordBullyun]

6 minutes ago, Dakaras said:

It's a smashing looking coin! Maybe just one of those random things. 

[stefffana]

5 minutes ago, Dakaras said:

It's a smashing looking coin! Maybe just one of those random things. 

Thank you, Dakaras!

I am very sure it is not random, because all of them have the same weight of 9.57g. 

Should be a division of another measurement unit, but I have no idea.

It's an obsession now for me.

[stefffana]

Maybe @LawrenceChard can help me? 

[Dakaras]

13 minutes ago, stefffana said:

Thank you, Dakaras!

I am very sure it is not random, because all of them have the same weight of 9.57g. 

Should be a division of another measurement unit, but I have no idea.

It's an obsession now for me.

No as in them reaching that weight decision on all the coins. Maybe target was 10 with 9 grams gold and someone messed up with the dies and blanks had to be 9.57 instead! 

[stefffana]

1 minute ago, Dakaras said:

No as in them reaching that weight decision on all the coins. Maybe target was 10 with 9 grams gold and someone messed up with the dies and blanks had to be 9.57 instead! 

Year after year? Perth Mint and Franklin mint?😁 

Dakaras have a new obsession.😊

Edited May 20, 2022 by stefffana

[James32]

1 minute ago, stefffana said:

Year after year? Perth Mint and Franklin mint?😁

Was the bird depicted 9.57 inches tall?

[Dakaras]

5 minutes ago, stefffana said:

Year after year? Perth Mint and Franklin mint?😁 

Dakaras have a new obsession.😊

Yeah well once you set the weight you would be right in the cart if you changed it! 

[Dakaras]

Maybe as 9.57g is close to 1/3 Oz? 

[James32]

3 minutes ago, Dakaras said:

Maybe as 9.57g is close to 1/3 Oz? 

That would only make 25g of .999 

Easiest option would be to reach out to the perth/ Franklin mint and ask?

[stefffana]

Just now, Dakaras said:

Maybe as 9.57g is close to 1/3 Oz? 

1/3oz is 10.367g. It is too big difference.

[LawrenceChard]

42 minutes ago, stefffana said:

Maybe @LawrenceChard can help me? 

I did see your OP earlier, but don't know anything which would help in this case.

Did you work out the AGW, Actual Gold Weight, in grams and troy ounces?

It's  may give clues as a starting point.😎

😎

[Dakaras]

13 minutes ago, James32 said:

That would only make 25g of .999 

Easiest option would be to reach out to the perth/ Franklin mint and ask?

Just thinking the same

 

[stefffana]

4 minutes ago, LawrenceChard said:

I did see your OP earlier, but don't know anything which would help in this case.

Did you work out the AGW, Actual Gold Weight, in grams and troy ounces?

It's  may give clues as a starting point.😎

😎

Yes, I have tried.

My coin is 9.57g of .999 gold, equating 0.3076oz.

Another coins are 9.57g of .900 gold, equating 0.2769oz.

I can't see something logical.

[Dakaras]

Ok maybe matching weight of fine gold to other coins? For example weight of fine Vs sovereign is wrong but what else?

[stefffana]

Just now, Dakaras said:

Ok maybe matching weight of fine gold to other coins? For example weight of fine Vs sovereign is wrong but what else?

I don't know...😓😓😓

[James32]

Just realised it's. 999 which makes things even more confusing, sorry @Dakaras my previous comment was based on .900

1 minute ago, stefffana said:

I don't know...😓😓😓

Auction?

[stefffana]

1 minute ago, James32 said:

Just realised it's. 999 which makes things even more confusing, sorry @Dakaras my previous comment was based on .900

Auction?

Nope.

This one is a keeper.😊

[LawrenceChard]

44 minutes ago, stefffana said:

Yes, I have tried.

My coin is 9.57g of .999 gold, equating 0.3076oz.

Another coins are 9.57g of .900 gold, equating 0.2769oz.

I can't see something logical.

The shape could be something to do with it, as the production team might have done some guesswork about what the blanks would weigh after stamping. Unlikely, but about as good as any other ideas.

😎

[stefffana]

2 minutes ago, LawrenceChard said:

The shape could be something to do with it, as the production team might have done some guesswork about what the blanks would weigh after stamping. Unlikely, but about as good as any other ideas.

😎

Thank you, Lawrence, but I don't think it is the correct answer.

These two coins are different shape, but the same weight.

9.57...9.57...9.57...9.57....grams...

Obsession...

https://en.numista.com/catalogue/pieces85721.html

https://en.numista.com/catalogue/pieces73085.html

[TeaTime]

...'Papua New Guinea established its sovereignty in 1975'... perhaps they picked three of the numbers, threw them in the air and went with however they landed.

A twentieth of an abucco is 9.82 grams.

A third of a duella is 9.44 grams.

2 zolotnics are 8.53 grams

a masha is 9.72 grams

I'm done !