Cuba 1989 25 Centavos [gelöst]

I am wondering if there is another way to tell the difference between the two different composition of these coins besides weight.

https://en.numista.com/catalogue/pieces2605.html

https://en.numista.com/catalogue/pieces22892.html

One is 6.2 g and the other is 6.44 g. I weighed the one I have and it is 6.30 g so I am still unsure which one it could be. Any help would be appreciated, thanks!

I am also having trouble with the 1989 10 Centavo coin. There are 3 listed, all look the same to me.

https://en.numista.com/catalogue/pieces3552.html

https://en.numista.com/catalogue/pieces31831.html

https://en.numista.com/catalogue/pieces65160.html

Weighed mine to be 3.94 g which eliminates the middle one. I don't think a scale would accurately be able to tell the difference between a 3.97 g and 4.00 g coin though, especially with tolerances and wear etc. Is there any other way to differentiate these ones?

Verweis : SolarPennyI am wondering if there is another way to tell the difference between the two different composition of these coins besides weight.

https://en.numista.com/catalogue/pieces2605.html

https://en.numista.com/catalogue/pieces22892.html

One is 6.2 g and the other is 6.44 g. I weighed the one I have and it is 6.30 g so I am still unsure which one it could be. Any help would be appreciated, thanks!

The 6.44 g. coin is made of cupro-nickel, the 6.2 g.  is made of stainless steel. Stainless steel has a very specific look, in principle you can't  be mistaken because of that specific look. Besides coins made of stainless steel are magnetic,  coins of cupro-nickel are not magnetic.

Verweis : SolarPennyI am also having trouble with the 1989 10 Centavo coin. There are 3 listed, all look the same to me.

https://en.numista.com/catalogue/pieces3552.html

https://en.numista.com/catalogue/pieces31831.html

https://en.numista.com/catalogue/pieces65160.html

Weighed mine to be 3.94 g which eliminates the middle one. I don't think a scale would accurately be able to tell the difference between a 3.97 g and 4.00 g coin though, especially with tolerances and wear etc. Is there any other way to differentiate these ones?

The coin in the middle is smaller (17,5 mm.) than the two other ones (21 mm.).
The difference between the first and third coin is again the composition, the first one is made of stainless steel (magnetic) and the third one is made of cupro-nickel (non-magnetic).

Thank you, used a magnet to figure it out!