Anti Reflective coating is applied to the crystal to enhance the legibility of the dial under light. It is a useful feature but there is one downside to its use. If applied to the underside only the coating is untouched and improves the legibility of the dial. I cannot fathom out why companies decide to coat the topside of the crystal when the coating does not share the same qualities as the crystal it is applied to.
I have seen many photos of watches with double sided AR coating and the result of it getting scratched doesn't look pretty.
For dress watches AR coating on both sides is acceptable in my opinion because the owner will not be engaging in "tool watch" activities.
There are some brands with certain models that are marketed as a tool watch and still they decide to AR coat both sides of the crystals. Rolex which for me invented the tool watch in the Submariner does not bother with AR coating at all. They only recently started to apply AR coating to the surface under the cyclops on models (this area cannot be scratched)
I will finish by posting a photo from a known brand and their instructions on how to take care of AR Coating.
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