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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
WEISO	Mini-telescope viewfinder for Elmar f= 3.5 cm 1:3.5; black or chrome; early with flare	1933-1950	-
WESTO	"Leicameter" exposure meter Weston model 650; large, black rectangular housing with chamfered corners	1936-19??	NY item
WICAB	Copy accessory lens cap with a shoe for angular finder WINKO	1936-1939	-
WICAP	Copy accessory lens cap with a shoe for angular finder WINKO	1931-1935	-
WINKO	Angle viewfinder for Standard Leica (model E) early versions have a larger eyecup	1929-	black or chrome
WINTU	Angle viewfinder for Leica II, Leica III & Leica IIIa with swing-in prism for right angle focus	1933-1948	black or chrome
WOOLD	Angle viewfinder for Standard Leica (model E) with additional interior prism	1938-1950	black or chrome
WOOSU	Angle viewfinder for Leica II, Leica III & Leica IIIa with swing-in prism for right angle focus with additional interior prism	1938-1948	black or chrome
WZCOO	Copy accessory lens cap with a shoe for angular finder WINTU for Leica II and III's	1936-1939	-