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Vietnam, Trinh

Started by Figleaf, July 26, 2016, 06:17:28 PM

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Figleaf

The carton said Canh Hung (1740-1786). Looking for confirmation (reverse looks blank) and advice on cleaning (don't know what material this coin is made of; it is not magnetic). If I had been on my own, I would have used a long bath in olive oil with quarterly sweeps with the glass fiber brush to get the worst off.

Colours are changed to bring out more detail. 600dpi pic available.

Peter
An unidentified coin is a piece of metal. An identified coin is a piece of history.

bgriff99

Yes it is Canh Hung.   Composition is brass, or leaded bronze, or something in between.   To clean, 9% hydrochloric acid, aka toilet bowl cleaner, and a toothbrush, but there isn't much there more to see.    Did somebody find this along the Thames or something?    One this bad does not normally become a numismatic item.   It's a 50p coin in XF.

Figleaf

Very useful tip, Bruce. IIRC, hydrochloric acid is used to clean steel and it is pretty dangerous for mere humans, so I'll settle for toilet bowl cleaner :) Now that I know it's brass, I have a commercial brass cleaner somewhere that works wonders on piping. Maybe I'll try that - it turns the brass into something pale yellowish - and restore some colour with olive oil.

Not sure where it was found. I found it among the duplicates of a very generous friend. In my collecting life (47 years) I have thrown out less than twenty coins (a few completely worn brass Turks and some Danish zinc coins turning into white powder) and spread collector happiness with many a dog of a coin that was used as a filler or better. This one will be mine until I get a better one, which may well be the rest of my life. :)

Peter
An unidentified coin is a piece of metal. An identified coin is a piece of history.