The patina does not look like the typical "fake old coin patina" you see on modern replicas. I'd be inclined to agree it's genuine.
Prior to Wang Mang, the Chinese currency had been stable ever since the foundation of the Empire over 200 years earlier, with just a single change in design over that time period.
Wang Mang implemented four currency "reforms" during his brief 14 year reign. Each one caused confusion and chaos, and ultimately saw the central government rake in lots of extra money at the expense of the common people he allegedly represented. I believe these coins are from the third reform.
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