Egypt, 25 piastres 1993

Egypt, 25 piastres 1993 (https://en.numista.com/catalogue/pieces1825.html) exists with two different edges: narrow reeding and wide reeding. A difference of 25 %: for every 12 reeds (reedings?) on one variety there are only 9 reeds on the other variety.
Ratio: on 7 coins 3 have narrow reeding, 4 have wide reeding, so both are probably common.

Hi,

I have 118 of those with 90% "rough" reeding and 10% with "fine" reeding. Maybe I should document that. OK, here is the dumentation, but my findings do not correspond to yours? Have a look:


Ole

Hey Ole, I've found a 3rd variety and that matches exactly your findings. As you can see on your pictures the last ridge on both pictures is not complete. If you make your pictures a little bit smaller and leave that last ridge behind, than you have 6 and 12 ridges and that exactly match my last found coin. For every ridge on variety 1 there is an extra ridge on variety 3.

My sample size for a reliable ratio is too low, but I have now, for the same distance of 9 ridges on variety 1:

Variety 1: 9 ridges: 4 pieces
Variety 2: 12 ridges: 3 pieces
Variety 3: 18 ridges: 1 piece

I know it's a terrible picture and you probably can't use it for your documentation, but at least now you have an idea about the three different edges for this type:

Quote: "Essor Prof"​Hey Ole, I've found a 3rd variety and that matches exactly your findings. As you can see on your pictures the last ridge on both pictures is not complete. If you make your pictures a little bit smaller and leave that last ridge behind, than you have 6 and 12 ridges and that exactly match my last found coin. For every ridge on variety 1 there is an extra ridge on variety 3.
​
​My sample size for a reliable ratio is too low, but I have now, for the same distance of 9 ridges on variety 1:
​
​Variety 1: 9 ridges: 4 pieces
​Variety 2: 12 ridges: 3 pieces
​Variety 3: 18 ridges: 1 piece

​with the amount of coins I have, I'll have a second search for the medium size edge and hopefully I'll find one and then include it in the documentation. Be back when I have had a look.
Ole

Hi,

so here is the documentation including the medium ridges. Actually the fine ridge is quite uncommon!


Ole