Sudan 1 Dinar 1994 varieties have different compositions [solved]

citation from https://en.numista.com/catalogue/pieces2123.html

"Composition: Brass

There are two varieties of this coin exist:
1. Denomination with 11 oblique lines/ Narrow shaded ( common)
2. Denomination with 5 lines / Widely shaded ( very rare)"

my widely shaded variety has a lamination crack. hard to make a good photo, but under the lamination, I can see dark gray metal that looks like zinc.



the weight of coins is also different



and both differ from the weight in the catalog (5.45 g)
the thickness of both coins is 2 mm (1.86 mm in the catalog)
diameters of both coins are 22 mm (same as in the catalog)
perhaps this coin has more than two varieties

in addition, the Reverse design has more differences than Narrow/Widely shaded denomination



I don't know if these coins should be split, but their compositions are different

Just in case the core is steel, have you checked with a magnet?

both are not magnetic

Is there something like central bank of Sudan where we could find info?

Quote: "Jarcek"​Is there something like central bank of Sudan where we could find info?

​Ask Dato Mikeladze.

Bump?

I just sent a PM to Dato Mikeladze to ask him to have a look, he's an expert on coins from Africa and therefore also Sudan.

Sjoelund

I just sent a PM to Dato Mikeladze to ask him to have a look, he's an expert on coins from Africa and therefore also Sudan.

Thanks!

Hello,dear  friends,

Thanks, Ole,  to send me a pm.

Unfortunately , “expert” is too  high  level  for my knowledge in this field,  Im just  a collector, concentrated on African coins . 

what can I do -  I will  look at my pieces ( have both) in the evening , try them by magnet and will measure them too.

Yes, they have a lot of differences, but  number of lines in Arabic “1” is just most visible.

If you could somehow carefully fix the coin in a small  vise, and then carefully scratch the inner part by needle , we could define  is the coin composes with  homogeneous alloy, or a heterogeneous one. Zinc will have a  silver-colored trace  when scratched, while brass will be golden. now the  dark color  may be due to oxidation.
Central bank of  Sudan has exact composition of  coins and sets which were  minted in foreign  respected  mints ( first sets) . later coins have a very inaccurate description of “Experts”  like me.  😁  : I see that the coin is non-magnetic, it is yellow, heavy and it is not copper. So it's brass. 😇 no collector will cut a rare coin to make sure of its composition.
Thank You all  again for this discussion. If this will  different alloy, so it should be  cataloged as different number, and not  like subtype. .

YOurs,

David.

So there is no source we could look at?

No, I dont know any govermental source .

 

I checked my 1 dinar, - can say that it is also non-magnetic  and its weight is 5,57 as well.

 

best

D

Bumping this again. Even with absence of concrete conclusion, I guess we could add comment on the page saying that different metal varieties are reported.

Sounds OK to me.

Jarcek

Bumping this again. Even with absence of concrete conclusion, I guess we could add comment on the page saying that different metal varieties are reported.

Was it done?

Just linked it on the page.