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Illustrations and extensive description of the items listed below can be seen in Dennis Laney's definitive Leica 1984 Accessory Guide courtesy of Mike Butkus

Leica Code	Description	Production Year	Remarks
NAKUL	Film viewer with magnifier and indicator punch; with handle; the 250 version has side cups to handle a long strip of film	1936-19??	Fontenelle archive [1]
NAMAS	Opal glass to fit behind the film in a film viewer	1930's	Fontenelle archive
NATRA	Film viewer with magnifier and indicator punch; without handle	1932-19??	Fontenelle archive
NIKKO	Binocular Telescope 8x6° with adjustable eye-pieces, table tripod	1930s	-
NOKUM	Close focus accessory with parallax for Summar f= 5 cm 1:2 lens (formerly NOOKY-HESUM)	1960-19??	16505
NOOBU	Film viewer without indicator punch	1951-19??	Fontenelle archive
NOOKY	Close focus accessory with parallax for Elmar (I) f= 5 cm 1:3.5 lens	1935-19??	16500
NOOKY-HESUM	Close focus accessory with parallax for Hektor f= 5 cm 1:2.5 or Summar f= 5 cm 1:2 lens	ca.1935-1959	-
Novoflex	Lens mounting system for Cini and Camera with pistol-grip focusing by squeezing. Originally made by AFGA	1957-current	see Visoflex