I have literature on almost every company that made a nozzle, but I do not have anything on March. Back in the 1970s when I was a Shell dealer and one of my nozzles went bad, we did not wait until someone sent us a nozzle. On a shelf in the station was two or three rebuilt nozzles put there on consignment. We quickly took of the old one and replaced it with a rebuilt one, we did not care who made it, we just needed to get the pump back in service. Around one a month the rebuilder would come buy, take the old one, replace it with a rebuilt one and charge me for the one I used.
I have a section on my website about nozzles, but I don't think this company is mentioned:
http://petrolianacollectibles.com/pc-1.htm perhaps this will help you.
From the configuration of the top of the nozzle where the large hole is, this appears to have been used on visible pumps where the nozzle was hung up near the cylinder.
Jack Sim