CLMartinez
Joined: 25 May 2023
Posts: 44
Posted: 16 Sep 2025, 17:22
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Edited: 16 Sep 2025, 17:24
Posted: 16 Sep 2025, 17:22
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Edited: 16 Sep 2025, 17:24
Any information on this would be very helpful.
Plastic is sealed so I can't tell the weight of each… HELP!
tokul
Joined: 5 Jul 2022
Posts: 1090
Posted: 16 Sep 2025, 17:34
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Edited: 16 Sep 2025, 17:39
Posted: 16 Sep 2025, 17:34
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Edited: 16 Sep 2025, 17:39
Search for “Progress and harmony for mankind” in your favorite search engine.
Osaka, 1970
https://coinweek.com/the-numismatic-legacy-of-expo-70-a-collectors-journey/
Based on the looks, you got silver proof variants.
CLMartinez
Joined: 25 May 2023
Posts: 44
Posted: 16 Sep 2025, 17:40
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Edited: 16 Sep 2025, 17:41
Posted: 16 Sep 2025, 17:40
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Edited: 16 Sep 2025, 17:41
I've done that and those are different coins from my set. A seller from eBay is selling a set with a box but no information that I can use.
rsirian1
Joined: 20 Nov 2020
Posts: 12934
Posted: 16 Sep 2025, 17:46
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Edited: 16 Sep 2025, 17:49
Posted: 16 Sep 2025, 17:46
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Edited: 16 Sep 2025, 17:49
Another seller posted this:
Says Sterling Silver.
But I doubt it if you bought it for US $19.95.
CLMartinez
Joined: 25 May 2023
Posts: 44
Posted: 16 Sep 2025, 17:50
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Edited: 16 Sep 2025, 17:51
Posted: 16 Sep 2025, 17:50
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Edited: 16 Sep 2025, 17:51
Right? Haha. But there is no other examples I can find. Any other information? Please…
rsirian1
Joined: 20 Nov 2020
Posts: 12934
Posted: 16 Sep 2025, 17:53
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Posted: 16 Sep 2025, 17:53
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Maybe…
Idolenz
Catalogue referee
Joined: 13 Jul 2013
Posts: 9572
Posted: 16 Sep 2025, 18:03
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Edited: 16 Sep 2025, 18:03
Posted: 16 Sep 2025, 18:03
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Edited: 16 Sep 2025, 18:03
Without assay marks people can think it's just silvered, if you don't take it out and test it so you could get it for a cheap price. On the website linked it states ‘out of pure silver’ if it has the ‘pure silver’ stamp it could be from 999-950 from that era (I can't decipher the number in the diamond stamp).
CLMartinez
Joined: 25 May 2023
Posts: 44
Posted: 16 Sep 2025, 18:15
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Posted: 16 Sep 2025, 18:15
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tokul
Search for “Progress and harmony for mankind” in your favorite search engine.
Osaka, 1970
https://coinweek.com/the-numismatic-legacy-of-expo-70-a-collectors-journey/
Based on the looks, you got silver proof variants.
Sorry, I did not see the link you posted at first. I looked and I saw three of the coins on that article. All three say made of 19 grams of silver. Did I just get lucky?
CLMartinez
Joined: 25 May 2023
Posts: 44
Posted: 16 Sep 2025, 18:17
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Edited: 16 Sep 2025, 18:19
Posted: 16 Sep 2025, 18:17
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Edited: 16 Sep 2025, 18:19
rsirian1
Maybe…
Does this mean I have to open the case and find the stamp? I'm guessing the stamp would be on the side? I don't see any on both sides
rsirian1
Joined: 20 Nov 2020
Posts: 12934
Posted: 16 Sep 2025, 18:21
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Posted: 16 Sep 2025, 18:21
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CLMartinez
rsirian1
Maybe…
Does this mean I have to open the case and find the stamp?
I don't think so. I just noticed that yours is different from the ones in the picture I posted.
Those stamps are not on yours. I think there is a silver version and a non-silver version.
CLMartinez
Joined: 25 May 2023
Posts: 44
Posted: 16 Sep 2025, 18:25
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Edited: 16 Sep 2025, 19:06
Posted: 16 Sep 2025, 18:25
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Edited: 16 Sep 2025, 19:06
Yes. Mine only has one mark like the one on top. Safe to say I have the non-silver version? They are all missing the assayer and privy marks.
CLMartinez
Joined: 25 May 2023
Posts: 44
Posted: 16 Sep 2025, 19:22
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Posted: 16 Sep 2025, 19:22
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I was able to open the case without damaging it and here's their individual weights and measurements:
US Pavilion = 14.1 g - 25.2 mm
Osaka = 13.9 g - 25.2 mm
French = 14.4 g - 25.2 mm
British = 14.0 g - 25.2 mm
Canada = 14.2 - 25.2 mm
rsirian1
Joined: 20 Nov 2020
Posts: 12934
Posted: 16 Sep 2025, 19:33
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Posted: 16 Sep 2025, 19:33
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If you could measure the thickness you could estimate the density.
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