Looks almost like a plastic lens typically found on GE M-250 lights from the 70s and 80s. Is this a later OV-25 then? My OV-25 remote ballast has the old logo and a different refector pattern. i think it's really cool how many different refractor variations Westinghouse had for their OV-25 lights. GE kept alternating between shallow and deep glasses for the M-250 line and M-400 line for whatever reason. Looks like they stuck with the deep glass for the M-400R2/A2 and an all-new shallow glass for the M-250R2/A2. I wish they had kept the old school deep glass for the M-250R2. I love the deep GE M-250 style glass.