Here is my newest Lantern, a Swiss Made Standard No.400a. I got it in very good condition. It is a 500cp Lantern.
Just by chance I found this recently. https://worldwide.espacenet.com/publicationDetails/originalDocument?CC=DE&NR=689809C&KC=C&FT=D&ND=3&date=19400404&DB=&locale=en_EP#
Here are two images from the first run at Friday. This is my 2nd. Standard Hanginglamp, they are so uncomplicated, I like them
Here is a picture from an old catalouge (it is not mine). Maybe Peter (Lampenkueche) can help You can also take a look in the reference libary:
ah yes I remember that one. But catalogues are for selling stuff and 500 sounds better then 400 or 350. Numeros on lamps most often have a relation with the HK/CP they produce. But hey, its a nice working lamp ! So 400 or 500 or 350 who cares.