Thailand 1 Um Coin - Not Magnetic Colour Diff

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Author	Replies: 13 / Views: 10,397
Pshann Valued Member Australia 119 Posts	Posted 06/16/2019 02:05 am Hi all Came across this coin Bottom coin is diff colour and non magnetic Not sure if normal Thx Report this Post to the Staff

owatchman Pillar of the Community United States 1494 Posts	Posted 06/16/2019 04:26 am These are 1 baht coins. If I'm reading the Thai characters right, you have a 2547 and 2548 (2004 and 5 in our calendar). The '48 was minted by the RMC. It's possible the metal content of cupronickel was just a little off. Or that the environment the two coins were in was different enough to give it the slightly different appearance. Here's the Numista link in case you want some more info on the coin https://en.numista.com/catalogue/pieces1106.html Edited by owatchman 06/16/2019 04:27 am Report this Post to the Staff
Pshann Valued Member Australia 119 Posts	Posted 06/16/2019 7:01 pm Thankyou Report this Post to the Staff
Pshann Valued Member Australia 119 Posts	Posted 06/17/2019 05:44 am Just a question? Why would the bottom coin be non magnetic and the one above is magnetic? Report this Post to the Staff
sel_69l Bedrock of the Community Australia 21786 Posts	Posted 06/17/2019 06:57 am Normally, 1 Baht coins are made from non magnetic copper nickel. Pure nickel and some versions of stainless steel are magnetic. I am guessing that the slightly brown coin may be made of very low nickel (only) stainless steel. The slight admixture (guess 3-5 % ?) of nickel in an iron coin would whiten the alloy, and make it far more resistant to corrosion. Such an alloy would be magnetic. A hypothesis: I must admit, I have never encountered such an alloy for coins, so perhaps it may be a test alloy coin. Perhaps it would be advantageous to put a few hundred thousand coins into circulation, and test them for wear and corrosion in circulation. They could be easily found by magnetic methods for extraction from circulation for subsequent examination and testing. You may have a scarce to rare coin. See if you can get your hands on as many other One Baht coins from dealers' junk boxes, and do a magnetic statistical study on the alloys. An easy and interesting piece of numismatic research. I note the green tinge patch on the darker coin. Perhaps other members here in the CCF may join into such a research. I will do my bit. Report this Post to the Staff
Pshann Valued Member Australia 119 Posts	Posted 06/17/2019 4:16 pm Thanks Report this Post to the Staff
Pshann Valued Member Australia 119 Posts	Posted 06/18/2019 03:55 am Hi Sel We have a dilemma! I have checked all the 1 baht coins and have found that of about 300 coins in total- I have found approximately 50 which are magnetic Report this Post to the Staff
Pshann Valued Member Australia 119 Posts	Posted 06/18/2019 05:20 am Ok - I think I have discovered the answer The web tells me that coins from 2008 onwards are steel That makes sense why there are so many. Now all I have to do is find the coins dated prior to 2008? Can anyone confirm this? Report this Post to the Staff
triggersmob Pillar of the Community Australia 9381 Posts	Posted 06/18/2019 5:53 pm Have a look at Y#183 & Y#443 here.... https://en.numista.com/catalogue/in...y&te=y&cat=y Steve Report this Post to the Staff
sel_69l Bedrock of the Community Australia 21786 Posts	Posted 06/18/2019 6:53 pm Thanks for the answer, which appears to be conclusive. Report this Post to the Staff
Pshann Valued Member Australia 119 Posts	Posted 06/19/2019 05:20 am Steve Thankyou Report this Post to the Staff
Pshann Valued Member Australia 119 Posts	Posted 06/19/2019 05:41 am Steve and Sel What about this magnetic coin? Cannot work out date Report this Post to the Staff
triggersmob Pillar of the Community Australia 9381 Posts	Posted 06/19/2019 05:57 am The date is 2554 which is 2011. Useful date convertor... http://creounity.com/apps/time_mach....htm&lang=en Steve Report this Post to the Staff
Pshann Valued Member Australia 119 Posts	Posted 06/19/2019 07:22 am Thx Report this Post to the Staff
	Replies: 13 / Views: 10,397

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