I would remark, "This 'thing' - whatever it is - is apparently incapable of reproducing!"
(Grant me that I am permitted to take the watch into a lab and observe it long enough - to place it on growth media, etc. - to come to this conclusion.)
The mere fact that it cannot reproduce itself - that it thus lacks one of the basic properties or earmarks of life - is already a strong indication that it is a mere artifact, i.e., that it was MADE.
Whereas: A living organism is far more likely to be the product of countless generations of evolution over billions of years.
Regards,
How much more?