I would say that it isn’t glass, but plastic and the cracks you saw (no missing pieces I assume) were stress cracks on one side of the plastic. Many plastics will reform to their original flat or molded shape if left standing. In your case the mount constrains the flattened dome of plastic so that as it returns to shape it closes the cracks so they are tight and hard to see. This could be tested by removing the body of the watch and or the crystal and pushing in the center, the cracks might open up.
Either that or “It’s alive, alive I tell you” Dr.F
maybe the heat did it?
What? Lucky. Probably the light.
I would say that it isn’t glass, but plastic and the cracks you saw (no missing pieces I assume) were stress cracks on one side of the plastic. Many plastics will reform to their original flat or molded shape if left standing. In your case the mount constrains the flattened dome of plastic so that as it returns to shape it closes the cracks so they are tight and hard to see. This could be tested by removing the body of the watch and or the crystal and pushing in the center, the cracks might open up.
Either that or “It’s alive, alive I tell you” Dr.F
lol maybe u n mumbear r both insane! or what mike said……..