Some Interesting Contemporary Chinese Counterfeits

Are these what you're talking about

I've been reluctant to post here because I need to sit down with the coins and have a one-on-one with someone that knows more about them than I do.
In other words, I don't know how to tell if some were made back in the day or many decades later. And I'm not sure just a picture can do that.

Interesting examples Albert.

This is my opinion.
1) Manchuarian - looks modern cast
2) 1930 Szechuan 100 cash. Can't tell but potential modern as well. This is an odd example as the original ones are not supposed to have dentrils but this one does.

The next ones are a bit tricker. I thought both may be ok but usually the weight and edge test would reveal most of the basic counterfeit. If I had to name one, maybe the second one as it shows some odd wear. This is supposed to be around 5.3g from memory. I believe more than 700+ million were struck so they are very common. Maybe a couple of decades ago, these were often found in junk coin lot.

This is my example of example



Just to make it harder, this 10 cents is NOT genuine as it is magnetic



And to throw in another wild piece - this is a more modern fake

I began looking through the albums of dollars and wondered if apparently worn down dragon scales could indicate a circulated coin?
I don't think so in this case.
This coin is not listed among Kann's "mint sports" and was not known to collectors until 1975.