20 Grosz 1923 - Poland - Coin Community Forum

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Author	Replies: 5 / Views: 1,305
Slerk Pillar of the Community Russian Federation 1557 Posts	Posted 11/01/2020 10:44 pm I recently bought 20 grosz 1923 - Poland. I know that this coin is found in different types of metal. How do I know my metal? Report this Post to the Staff

sel_69l Bedrock of the Community Australia 21788 Posts	Posted 11/02/2020 05:12 am 20 Groszy dated 1923 struck in three different metals. - Nickel, weight 3.0 grams - Zinc, weight 2.97 grams, - these coins all struck in the war years 1942 to 1944, but with a fixed date of 1923. - Brass weight 4.53 grams, - yellow alloy of copper and zinc struck in piedfort proof (thicker than standard). Zinc is much more prone to corrosion and gray in color, than nickel (which is silvery in color), so easy to tell apart. Report this Post to the Staff
Slerk Pillar of the Community Russian Federation 1557 Posts	Posted 11/02/2020 06:25 am I still think I have Zinc. Is that so? Can you confirm or deny this from the photo ? Report this Post to the Staff
sel_69l Bedrock of the Community Australia 21788 Posts	Posted 11/02/2020 07:11 am I agree; from the picture, it appears to be *zinc*. Report this Post to the Staff
tdziemia Pillar of the Community United States 7962 Posts	Posted 11/02/2020 08:55 am Zinc is less dense than nickel, so you coud try to measure density. Also, the zinc coin is 1.5 mm thick, but the nickel coin is 1.3 mm. A micrometer could easily tell this difference. As @sel said, zinc oxidizes easily, and tends to develop a sort of powdery/rough surface. Nickel tends to remain smooth. Maybe @gumer or @geralttt can also comment since they know a lot about Poland coins from the modern era. Edited by tdziemia 11/02/2020 08:58 am Report this Post to the Staff
norantyki Valued Member 404 Posts	Posted 11/02/2020 1:02 pm Yours is a Zinc example. They were nickel plated in the hope that the occupied people [Poles] would accept them as on par with II Republic coinage - they were not, and were much hated. To illustrate appearance of the metal, here is an example of the original Second Republic issue in Nickel: https://norantyki.com/european-coin...-groszy-coin Micrometer, scale and experience make identification of the occupation small change easy. Report this Post to the Staff
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