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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
HAKOSYN	Flash synchronization attachment for an unmodified M3	19??-19??	-
HEBOO	Slow speed shutter release for 1, 1/2, 1/4, 1/8 s in nickel or later chrome	1935-1969	-
HEFAM	Hektor f= 13.5 cm 1:4.5 black M-mount	1954-1960	HEFAR-M
HEFAM-CHROM	Hektor f= 13.5 cm 1:4.5 chrome M-mount	1954-1960	-
HEFAM-KUP	Hektor f= 13.5 cm 1:4.5 nickel	1933	-
HEFAR	Hektor f= 13.5 cm 1:4.5 chrome	1933-1959	-
HEGRA	Hektor f= 7.3 cm 1:1.9 black lacquer & chrome	1934-1946	-
HEKON	Hektor f= 7.3 cm 1:1.9 black lacquer & nickel	1931-1933	-
HEKTO	Hektor f= 5 cm 1:2.5 nickel or chrome	1930-1936	-
HEPET	Close-up supplementary front lens no. 3 for Hektor 5 cm	1928-1950's	-
HEPIK	Close-up supplementary front lens no. 2 for Hektor 5 cm	1928-1950's	-
HEPRO	Close-up supplementary front lens no. 1 for Hektor 5 cm	1928-1950's	-
HFOOK	Short-base clip-on rangefinder for Leica models A, B & C	1920's-ca.1936	-
HGOOI	Rear cap for f = 12.5 cm 1:2.5 Hektor - with front cap ORPNO it became a container for the lens JCB's a little...If	1930's-1960's	14053
HIIBE	Stand for photographing small objects; with adjusment by rack and pinion; with rotation and tilt	1939-19??	-
HIKOO	f = 12.5 cm 1:2.5 Hektor Visoflex lens	1954-1963	JCB's a little...If
HKMOO	Hood for f = 12.5 cm 1:2.5 Hektor- with front cap ORPNO and rear cap HGOOI was a container for the lens JCB's a little...If	1954-1963	12532
HMOOD	Hood for 90 mm f/2 Summicron	1957-19??	-
HOOAR	Yellow no. 0 very light filter; screw-on type E39	ca.1955	13081
HOOBE	Yellow no. 1 light filter; screw-on type E39	ca.1955	13086
HOOCS	Infra-red no. 1 light filter; screw-on type E39	ca.1955	-
HOODF	Infra-red no. 2 medium filter; screw-on type E39	ca.1955	-
HOOET	Infra-red no. 3 dark filter; screw-on type E39 Mario Cavina	ca.1955	-
HOOFG	Panchromatic filter; screw-on type E39	ca.1955	-
HOOGU	Orange filter; screw-on type E39	ca.1955	13101
HOOIV	UVa filter; screw-on type E39	ca.1955	13131 13132
HOOKI	Blue filter; screw-on type E39	ca.1955	13098
HOOPY	Hektor f= 2.8 cm 1:6.3 nickel	1935-1936	-
HOOPY-CHROM	Hektor f= 2.8 cm 1:6.3 chrome	1936-1955	-
HOOSN	Complete Endo-Visoflex (without adapter) for screw-mount	19??-19??	-
HOOSN-M	Complete Endo-Visoflex (without adapter) for M-mount	19??-19??	-
HOOTA	Endo-Visoflex housing for screw-mount	19??-19??	-
HOOTA-M	Endo-Visoflex housing for M-mount	19??-19??	-
HOOVB	Ground glass screen in Endo-Visoflex mount	19??-19??	-
HOOWP	Plain glass screen in Endo-Visoflex mount	19??-19??	-
HOOXC	4 x right-angle Endo-Visoflex magnifier	19??-19??	-
HOOYQ	Lens mount with revolving disc for Endo-Visoflex	19??-19??	-
HOOZD	Interchangeable lens for Endo-Visoflex	19??-19??	-
HPOOA	Empty Endo-Visoflex mount for additional lenses or filters	19??-19??	-
HPWOO	Correction lenses for Endo-Visoflex -1, -2, +4 & +6 diopters	19??-19??	-
HQYOO	Adapter for Endo-Visoflex by Storz, Tuttlingen DE	19??-19??	-
HQYOO	Adapter for Endo-Visoflex by Wolf, Knittlingen DE	19??-19??	-
HROOY	Interchangeable infrared disc for Endo-Visoflex	19??-19??	-
HSCOO	Adapter for Endo-Visoflex by Deutsch Endoscopbau Ges. Sass; Wolf & Co.m.b.H Berlin	19??-19??	-
HSOOX	Polished wooden storage box for Endo-Visoflex	19??-19??	-
HUGY	Underwater camera enclosure	19??	-