Quote:
...except it had a 1 on the reverse side rather than a 5...
That would be the copper-coloured 1 yuan, rather than the 5 yuan. 1 yuan coins that "look like this" are made of aluminium-bronze.
As for value, I'm afraid the answer is "not much". The 1 yuan is the smallest coin in everyday circulation, with a face value equivalent to about 3 US cents.
NGC database page.
Don't say "infinitely" when you mean "very"; otherwise, you'll have no word left when you want to talk about something really infinite. - C. S. Lewis