Here's a Hewlett that came home with me from a local flea market this past Sunday next to a CD 134 for size comparison. There are no markings on it. Looks to be a Thomas glaze after comparing it to some bigger disks I have. It measures 7-1/2" diameter and the height at the rim is 1-1/2". It accepts the standard copper u-bolts. Any feedback on this item would be greatly appreciated. Thanks for stopping by.