The consensus is CD 321. Check the price guide appendix to see this CD mold variation.

Dimensions (using calipers): Height- 4 and 3/4"; Width (across umbrella)- 6 and 1/4" There are four bracing ribs at 90 degree spacing from each other under the umbrella.

Embossing Detail: This is a PRISM with the following detail: (F-Umbrella) (convex arc) REGISTERED/ (convex arc) TRADE MARK/ (prism symbol) (R-Umbrella) (concave arc, along rim) "PATENTED (JU)NE 17, 1890" SB

Note: A chip off the umbrella took out the (JU).

Glass color is blue.

My issue is with the dimensions. The measurements are not lining up with any of the drawings.

Thanks.