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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
SAIOO	"Sports" viewfinder for Hektor f= 7.3 cm 1:1.9 lens	?	-
SAMWO	F = 3.5 cm 1:2 Summicron I for M3	1958-1969	11 108 - 9,557 pieces
SAWOM	35mm f/2 Summicron II for M2	1958-1969	11 308 – 11,935 pieces
SAWOO	Summicron (I) f= 3.5 cm 1:2	1958-1963	11 008 ~500 pieces
SBKOO	Enclosed chrome, flared cone viewfinder for 21 mm with parallax adjustment by concentric ring like SGVOO ; later versions are black	ca.1960	12002
SBLOO	Finder for SOONC-M Summaron f= 3.5 cm 1:3.5	ca.1951-1960	12010
SCNOO	Rapid winder for Leica IIIa (model G), Leica IIIb	ca.1937	-
SDOOG	Tripod head with spring catch for rapidly fixing camera to tripod	1936-1949	-
SELAN	Angle bracket to enable vertical flash unit	ca.1947	-
SELBA	Battery case for SELIS or SELBA flash units	1947-19??	-
SELCA	14 inch flex cable for vertical flash unit	ca.1947	-
SELEX	10 foot flash cable for remote flash unit	1947-19??	-
SELIS	Horizontal flash unit with delay slider for Leica IIc and Leica IIIc	1947-19??	-
SELLO	6 foot flash cable for remote flash unit	1947-19??	-
SELOR	Three-way flash socket to attach leads to a synchronizer	19??-19??	-
SELSY	Horizontal flash unit with delay slider for Leica cameras above sn. 111450 except Leica IIc and Leica IIIc per SELIS	1947-19??	-
SEROO	"Sports" viewfinder for 9 cm lens	?	-
SEOOF	Summicron (I) f= 9 cm 1:2	1959-1962
SEOOF-M	Summicron (I) f= 9 cm 1:2		made in Canada only
SEOOM	Summicron (II) f= 9 cm 1:2	1959-1979	-
SEROO	Folding chrome or black (rare) viewfinder for 9 cm with paralax	1935-19??	-
SEVUE	Fixed cradle type, chrome & black viewfinder for 9 cm with paralax	1949-19??	NY item
SFTOO	17-45	19??-19??	-
SGOOD	Enclosed chrome, flared cone viewfinder for 85 mm with parallax adjustment by concentric ring like SGVOO	1951-19??	12020
SGVOO	90mm viewfinder/bright finder	1951-?	12025
SHADE	Replacement hood for Thambar f= 9 cm 1:2.2	1939-19??	-
SHOLD	Shoulder pad for a camera neck strap	1950-19??	NY item
SHOOC	Enclosed chrome, flared cone viewfinder for 135 mm with parallax adjustment by concentric ring like SGVOO	1951-19??	12030
SHXOO	13.8 mm shutter speed dial supplied free of charge for Leica's with a different sized dial	19??-19??	-
SIMOM	Summaron f= 35 mm 1:2.8 for M3	1958-1974	-
SIMOO	Summaron f= 3.5 cm 1:3.5	1958-1963	-
SIMOW	Summaron f= 35 mm 1:2.8 for M2	1958-1974	-
SIUUB-Glas	Parvo 100 / Prado 100 projector with Hektor 2.5/8.5cm	1949-1950	-
SIZOO	Folding viewfinder for 10.5 cm	1935	-
SLOOZ	Viewfinder, 28 mm, black or chrome	1960-?	12007
SMUUY	Parvo 100 / Prado 100 projector with condenser I (f. 7.3-10cm)	1949/ 1950	-
SMYOM	Rapid winder known as Leicavit-MP for M1, M2 and MD	1960-1966	14008, 14018-with 3/8" bush
SNHOO	Adaptor for using Summicron 42 mm E39 filters on Summitar	1957-19??	13078
SNOOX	Summaron f= 2.8 cm 1:5.6	1955-1963	-
SOMKY	Close focus accessory for collapsible version of the Summicron or Elmar 50mm lens, and with the front element of the fixed Summicron with the use of an adapter called UOORF	1956	also called SOOKY-M
SOMKY-UOORF	Close focus accessory for non-collapsible version of the Summicron with the use of an adapter called UOORF	19??-19??	16509
SOMNI	Summicron (II) f= 5 cm 1:2	1956-1968	11 818
SOOAW	Fixed cradle type, chrome & black viewfinder for Hektor f= 7.3 cm 1:1.9 with or without parallax adjustment	1943-19??	Lager doubts SOOAW was produced commercially
SOOBK	Hood for Summaron f= 2.8 cm 1:5.6	ca.1955-1963	-
SOOCX	Summarex f= 8.5 cm 1:1.5	1948-1960	-
SOODL	Viewfinder, 50 mm	ca.1949	Lager doubts SOODL was produced commercially
SOOEY	Adaptor for use of Summitar type L filters on 42 mm lenses	1957-19??	13077
SOOFM	108-9	19??-19??	-
SOOGZ	Adaptor for ADVOO with lenses of 36 mm diameter; also for use of Summicron 42 mm filters on 36 mm	1955-19??	13154
SOOHN	Hood for Hektor f= 2.8 cm 1:6.3	ca.1935-1955	-
SOOIA	Summarit f= 5 cm 1:1.5	1949-1960	-
SOOIA-M	F = 5 cm 1:1.5 Summarit	1952-?
SOOIC	Summicron (I) f= 5 cm 1:2	1953-1960	-
SOOKY	Close focus accessory for rangefinder Elmar 5c lens with parallax	?	-
SOOKY-M	See SOMKY	?	-
SOOME	Summilux (I) f= 5 cm 1:1.4	1959-1961	-
SOONC	Summaron f= 3.5 cm 1:3.5	1948-1960	-
SOONC-M	Summaron f= 3.5 cm 1:3.5	1956-1960	-
SOONC-MW	Summaron f= 3.5 cm 1:3.5 with viewfinder for the M3	1956-1960	-
SOONC-MT	Summaron f= 3.5 cm 1:3.5 with viewfinder for the M2	1957-1960	-
SOOQR	Adaptor for use of Summitar type L filters on 42 mm lenses	1954-1956	-
SOORE	Summitar f= 5 cm 1:2	1939-1955	-
SOOUV	Fixed cradle type, chrome & black viewfinder for 9 cm with or without parallax adjustment	1943-19??	-
SOOYV	Fixed cradle type, chrome & black viewfinder for 13.5 cm with or without parallax adjustment	1943-19??	-
SOOZI	Summicron (I) f= 9 cm 1:2	1957-1959	-
SOREI	Shutter release, soft, improved type; flared chrome cylinder	1949-19??	NY item
SPECS	36	19??-19??	-
SPMOO	65-6	19??-19??	-
SPOOM	Spare film take-up spool	1955-19??	14022
SPOOV	65-6	19??-19??	-
SPUCA	Spare film center cassette spool	19??-19??	14015
SPULM	Spare film take-up spool	1931-1953	-
SQTOO	17	19??-19??	-
STAFO	71-4	19??-19??	-
STALI	71-4	19??-19??	-
STAMA	71-4	19??-19??	-
STAOT	65	19??-19??	-
STARE	65	19??-19??	-
STEFA	103	19??-19??	-
STEKOA	103	19??-19??	-
STEKPF	103	19??-19??	-
STERO	38	19??-19??	-
STOOR	71	19??-19??	-
STUOO	61-74	19??-19??	-
STYYX	71	19??-19??	-
SUMAR	Summar f= 5 cm 1:2	1933-1940	-
SUNGO	108	19??-19??	-
SUOON	Super-Angulon f= 2.1 cm 1:4	1958-1963	-
SUOOQ	15	19??-19??	-
SUUHN	Parvo 100 / Prado 100 projector with condenser II (f. 5cm Summar/ Sumwithar)	1949-1950	-
SUUAI	Parvo 100 / Prado 100 projector with condenser III (f. 5cm Elmar/ Summar)	1949-1950	-
SUUZI	Film strip holder for projectors	1952	-
SUWOO	14-20	19??-19??	-
SVOOP	89	19??-19??	-
SYBAT	94	19??-19??	-
SYEOO	"Sports" viewfinder for 13.5 cm lens	?	-
SYNCO	94	19??-19??	-
SYOOM	Rapid winder for Leica IIIf or Leica IIIg	ca.1953	-

|- | SELAN|| 95 ||19??-19??|| - |- | SELBA|| 95 ||19??-19??|| - |- | SELCA|| 95 ||19??-19??|| - |- | SELEX|| 95 ||19??-19??|| - |- | SELIS|| 94 ||19??-19??|| - |- | SELLO|| 95 ||19??-19??|| -