It's really hard to find cosmetic parts for antique radios like replacement glass, escrutcheons, etc. You can get the electronics parts but the cabinets and cosmetic parts haven't been made in decades and that's not the kind of thing I'd expect anyone to keep as NOS items. You can sometimes find parts mules on eBay, and frankly, that's probably the only way to get most parts like that.One other option is maybe fabricating a new replacement. Can you cut a sheet of glass and make a replacement part? Is the dial indicator silkscreened on the glass or is it just clear glass?