Here we have a vintage domed clock glass.
This is old stock, most glasses had labels on which have been removed and cleaned.
Photographed on a lightbox to highlight condition, 
All in good order with just some minor flea-bites to rim, nothing that will notice once installed.
Diameter 99.61mm, height 6.00mm, Thickness 1.85mm.
Please note: Although photographed on a jiffy this is for storage only and will be posted in a box for a safe journey.