I would not recommend it, it is very thin plastic, it does not seem to have any oleophobic coating at all, all fingerprints remain on it, it distorts the image at the edges, and it does not cover 100% of the screen, it has a 1mm gap on the right/left side, making it very difficult to place it exactly in the center...
If it covered 100% of the screen, the image might not be distorted at the edges... :/
Having said all that, it is probably better than having nothing on the screen and it is unfortunate that when I bought it, the corresponding Spigen option was not available, which is a company that I have trusted many times and has not disappointed me (I have not yet tried this specific product):
https://www.skroutz.gr/s/31012591/Spigen-GLAS-tR-EZ-Fit-Tempered-Glass-2%CF%84%CE%BC%CF%87-Galaxy-Watch-4-Classic-42mm.html