old convex glass clock face covers, or picture frame bubble curved glass

Two round convex glass pieces for picture frames or covers for clock movements? These have rough unpolished edges, so must have been designed to fit in a frame of some type.
Size is 3 5/8" in diameter for the smaller glass, and 4 5/8" diameter on the larger glass.
- sku: #u66110
- status: sold out
- featured in these collections: