British Seagull Model Identification

Code	Model Series	Manufactured	Gearbox lube
SJM	Forty Minus	1955 to 1967	SAE 140
F	Forty Featherweight	1967 to 1976	SAE 140
GF	Forty Featherweight	1977 to 1978	SAE 140
FS	Forty Featherweight	1978 to 1979	SAE 90
GFS	Forty Featherweight	1978 to 1979	SAE 90
EFS	Forty Featherweight/Model 45	1979 to *	SAE 90
EGF	Model 45	1982 to 1984	SAE 140
AF	Model 45	1984 to 1985	SAE 140
EF	Forty Featherweight/Model 45	1985 to *	SAE 140
SJP	Forty Plus	1956 to1967	SAE 140
FP	Forty Plus Mark II	1967 to 1979	SAE 140
GFP	Forty Plus Mark II	1976 to 1979	SAE 140
EFPW	Model 60	1983 to *	SAE 140
EGFPW	Model 60	1982 to 1984	SAE 140
FPC	Forty Plus Clutch Drive	1978 to 1979	SAE 90
GFPC	Forty Plus Clutch Drive	1978 to 1979	SAE 90
EFPC	Forty Plus Clutch Drive/Model55	1979 to *	SAE 90
AFPC	Model 55	1983 to 1984	SAE 90
LLS	Century 100	1956 to1967	SAE 140
W	Century 100	1967 to 1973	SAE 140
CP	Century Plus Fixed Drive	1957 to 1967	SAE 140
WP	Century Plus Fixed Drive	1967 to 1969	SAE 140
CPC	Century Plus Clutch Drive	1959 to 1967	SAE 140
WPC	Century Plus Clutch Drive	1967 to 1973	SAE 140
S	Silver Century	1966 to 1969	SAE 140
WS	Silver Century	1969 to 1979	SAE 140
WSC	Silver Century Clutch Drive	1978 to 1979	SAE 90
ESC	Silver Century Clutch Drive/Model 75	1979 to *	SAE 90
SP	Silver Century Plus Fixed Drive	1966 to1969	SAE 140
SPC	Silver Century Plus Clutch Drive	1966 to1969	SAE 140
WSPC	Silver Century Plus Clutch Drive	1969 to 1979	SAE 140
ESPC	Silver Century Plus Clutch Drive/Model 80	1979 to *	SAE 90
EFNR	Model 110/Model 90	1979 to *	SAE 90
ENC	Model 125	1984 to *	SAE 90
EN	Model 170	1982 to *	SAE 90

Note: Letter ”L” after engine lettering or number denotes long shaft model. From 1963 a letter and a number code is used at the end of the engine number to denote the month and year of manufacture...the letter indicates the month and the number the year of manufacture i. e. A3 January 1963, B3 February 1963 etc. From 1973 two letters were used i.e. AA3 January 1973. BB3 February 1973, etc.