Nostalgia
Sukoshi Nihongo hanashimasu.
I can live with that. You could soak the cents en masse in some acetone, changing it if it gets colored and probing at any gunk with a q-tip....
My wife is Japanese and I have quite a few Japanese coins, but have never had a thought of trying for a year series.
Not even close. PVC = polyvinylchloride, no sulfur in there. The PVC can degrade to give hydrochloric acid which can damage the coins (copper...
So many dealer's junk boxes...so little time. Awesome collection, have fun. Do you speak/read Japanese? Have you been to Japan?
Even for US coins, these kind of errors usually raise the value only slightly unless they are really dramatic or somehow attract public interest....
It does look like the coin has been mis-struck with something filling part of the die. Here is one on e-bay:...
You are correct peachesgirl, and it is interesting, but not worth much if anything.
If you look at the negative reviews the seller is already accused of buying novelty coins and selling them as real.
Not too many coins made in the US in 1776 (none, I think). What does it look like? If you have trouble taking pictures, you could even scan it...
WOW
First coin is Chinese (Sun Yat Sen I think), the second is Korean and the last one is Japanese. Nothing rare.
Actually oxalic is a weak acid, although it is stronger than acetic (vinegar is 5% acetic acid). However oxalic acid is also a reducing agent...
It does have a good lens.
Should submit that one.
What it is graded often depends on whether you are buying or selling... : - )
Quick chemistry course. An acid is anything that supplies a hydrogen ion in water solution. Hydrogen ions are notorious for attacking certain...
Speaking of chemical cleaning, anyone ever try oxalic acid?
These are worth 12 billion dollars...each
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