There's this watch repairer on You tube who does wonders with clearing watch crystals that are scratched up. He uses something called cerium oxide. On those old pieces where a replacement crystal is not available.
My eyes can't tell the glass has been refinished.
Orifice Reducers restrict flow from a bottle so liquids and lotions squirt out instead of pour out. They fit snuggly in a bottle opening and can be sealed with a screw on cap.