Coin Composition / Type

Hi,
Regarding Guernsey 1986 Commonwealth Games commemorative two pound coin.
https://en.numista.com/catalogue/pieces131311.html
This coin is listed as Silver 0.925.
I had a request to change it to 0.500 Silver. I aske for more information to verify this.
However after searching myself I have found both 0.925 and 0.500 were produced.
mintage levels also are questionable - 2,000 / 2,500 / 50,000.

The listings I found are here: copy & paste links.

0.925 =
https://www.ebay.co.uk/itm/1986-Guernsey-Silver-Proof-2-Commonwealth-Games-in-Case-with-COA-F7-5/293293730669?hash=item4449ab2b6d:g:mRcAAOSwy~BZ8lGj

0.500 =
https://www.ebay.co.uk/itm/1986-Guernsey-Silver-2-Commonwealth-Games-in-Case-with-COA-F7-66/293022078486?hash=item44397a1616:g:CDYAAOSwDEtZ93GI

You'll notice the more superior coin (0.925) has a better case.

My question is this:
Is this a different coin, and should it have a separate listing?
Or should there just be a note to different composition being available?

Thanks,

Vern

If the material is different a new page as to be made.
They should differ in weight or thickness.

Weight and thickness will remain constant due to the other metals used in the alloy.

Vern.

Coin silver alloys are mostly silver and copper.
Density of Ag(.925) = 10.35g/cm³
Density of Ag(.500) = 9.642g/cm³

There are ony two options, either the coins have the same weight or the same volume.
If these are the properties of the .925 coin:
Weight: 28.82g
Diameter: 38.61 mm

A .500 coin with the same mass would be ~0.2mm thicker (this is not so accuarate because coins have a relief) or it would weight 26,32g.

Quote: "Idolenz"​Coin silver alloys are mostly silver and copper.
​Density of Ag(.925) = 10.35g/cm³
​Density of Ag(.500) = 9.642g/cm³
​
​There are ony two options, either the coins have the same weight or the same volume.
​If these are the properties of the .925 coin:
​Weight: 28.82g
​Diameter: 38.61 mm
​
​A .500 coin with the same mass would be ~0.2mm thicker (this is not so accuarate because coins have a relief) or it would weight 26,32g.

​Hi !
Same problem exists with Belgium 500 francs 1980 coins : this coin exists both in CuNi silver clad version and in 0.510silver. Thickness and weight are identical !