I'd be interested to see the blade. It's not impossible that genuine antiques do come out of China. I had a number of years ago a very rusty composite jian with similar certificate. As I didn't have the time to restore it I passed it along to another collector who had it assessed by two experts and it turned out to be possibly not even Chinese but likely 17th century.
So strange things can happen. Unfortunately with this one I'm somewhat doubtful, it looks very clean.
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