Mechanized Robby Dome : Nomura 3-1/4" tall at front.

Dome for Mechanized Robot 'Robby' and Astronaut by Rosko Nomura. Made of clear plastic. Additional photo's for reference only.  3-1/4" tall x 2-1/4 (at the base of the top)

Bottom curve is 3" across. (not around the curve).   Rear of dome is 1-3/8"