Westclox Big Ben Style 2 Base Variations

Big Ben Style 2 bases were made by several companies, including the Dura Company of Toledo, Ohio; and the Doehler Die Casting Company also of Toledo, Ohio. I've seen a few bases having a logo of a diamond with an ampersand inside, but haven't identified the company that logo belonged to. The most common bases have the letter "A" and other markings; and I don't know if Westclox or another company made them. The variations of the bases recorded here are not as significant as other features I've documented, but I found them interesting enough to record.