It's a 2020 version if it is written on the back.
Regarding the blow on the corner , you should mention it to the seller and ask for a replacement or if you don't want a replacement a little discount...I would have prefer a replacement because no proof it did not fall
I'm in doubt about the replacement. The reseller told me that he will send me a new device, but just the device (wihtout box and protective films) because it is the replacement by warranty from iBasso. He also assured me that is a new device. The express courier will take mine defected and deliver the new one.
I will let you know.
By the way, I'm doing a comparison between DX160 and Sony A105 (japanese). They both sound very good, but the DX160 has more powerful and brightness and air. I will sell the A105 to finance some new headphones or IEMs.