@bearer yep missed that at first! Shame, they were a really good price if they were authentic. Same price as a set of new clones though...

@bearer I think the heatsinks on the duex5 seals it. I didn't realise the original doesn't come with them. A quick search on some clone sites shows the duex5 clone comes with those exact heatsinks.

*Edit and the heatsinks on the duet2 as well. Clones of that also come with those exact heatsinks.

Thanks for the help

@bearer thanks for all the information. I've managed to get a picture but looks like the serial number sticker is missing -

Is there any way to tell if a Duet 2 WIFI is authentic or if it's a clone? I've been offered a used one but it's unclear whether it's legitimate. Seller reckons it came from 3dJake, which doesn't seem to sell them.