Lucas Electric Screenjet 4SJ 5SJ washer pump and bottle fits early Rover 2000 P6
Yes, this is a Lucas Electric Screenjet 4(!)SJ In contrast to the 2SJ and 5SJ this is a very rare item. Date stamp 4/63 (April 1963). Tested, in working condition.
Included is a 5SJ motor (not working) and a spare bottle with slightly different lettering. See images for details.