Marked "KENYONS PATENT SERILIGHT LENS LAMP", along with PAT No. 374645, (which refers to lamps fitted with reflectors). The reflectors are marked "KENYONS SERILIGHT LENS") and the lamp lenses marked "KENYONS SERILIGHT LENS PAT No. 320800". Door marked "NWP" for North West Power? Details of the patents can be found on Links and Patents page.