Looking at a bike but not sure if its genuine or not as the seller claims a previous owner resprayed it to his team colours and then back prior to selling it to him. I’ve heard stories about resprays for various reasons before and have doubts if the serial numbers are no longer there or visible.
I am basing my age estimate on the fact that t some point, and I am not sure when, Argon-18 cleaned up the drop out section. Here is a 2015 with the cleaned up drop out for reference (https://www.flickr.com/photos/glorycycles/16775191752). Your bike has the older style drop outs so I doubt its a 2016. Bikes with the older style dropouts may well have been sold over a number of years and the original owner may have purchased it in 2016 but it was old stock at that point.
I m working at argon 18, I know that that some Chinese copies has been around. For sure, the 3D system on it is a good sign. Just give me a day so I can check if we were placing sn number on the steerer or others signs.
The SN should be under the brakes (under BB). The bike look legit with the 3D system but the only way to confirm it is to get the SN and got it approved by your local distributor. Maybe you can ask about the reason of the paint. For sure, it’s not from us.