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Had one passed off to me which was 3mm thick. Tested with acid & smoked the scratch stone mark. Assume it is brass. Got the money returned & sent it back, but seller had moved with no forwarding address. So obvious a fake, but a 20k or so would need closer inspection. Prefer the scratch...

Try this forum http://www.coincommunity.com/forum/topic.asp?TOPIC_ID=133861. There is a very good photo of a die strike error. The ones in your photo look to be mis-handling, however, I think it would be hard to prove either way.

Whilst PCGS & NGC are well known, APCGS, Australian Professional Coin Grading Services, are a bit of an unknown to me. Would like to see some post of experiences with APCGS as to quality of service, premium on produces graded by them & other relevant experiences.

From the info that the coins were made when Constantine l was Emperor, This would infer a time around 270 - 290 AD. The Han Dynasty had disappeared & the Middle Kingdom was fragmented into the three kingdoms. Trade between european traders and China was almost non-existent. More likely the...

Not sure that the silver chloride will tone. The normal toning is a reaction of sulfur with silver to form a sulfide. Expect that when the coin acquires toning, the milk spots will either show through or take on a green hue. Either will look most unattractive.

Interesting, the period 1A.D. to 500A.D., is known as Kofun period. This was when people were buried in mounds often with treasure. This idea came from the Asian Continent, which in turn had periods in which the Sakas from Central Asia and the Roman Empire traded with the China (via Parthian...