Dating vintage neptune outboard motors

the model # is (1181) and seral is (50359) any help would be appresciated.I dont have a photo of mine but I believe it was a WC-1. At some point the WC-1 were made in different states by different contractors. A Korean firm bought up the Mity Mites parts and production and promptly bellied up.In 1948 Scott-Atwater began producing a line of private label outboards for the Corsair Motor Co. The outboards were distributed by both Skelly Oil Co. 1951 571.58301 1.25 571.58401 2.5 571.58561 5 571.58641 6 571.58751 7.5 571.58821 16 571.58841 16 1952 571.58201 2 571.58561 5 571.58751 7.5 571.58822 16 1953 571.58202 2 571.58562 5 571.58761 7.5 571.58823 16 571.58824 16 571.58844 16 1954 571.58211 2 571.58571 5 571.58651 6 571.58652 6 571.58771 7.5 571.58772 7.5 571.58851 16 1955 571.58211 2 571.58571 5 571.58711 7.5 571.58722 7.5 571.58901 12 571.59401 25 1956 571.5821 2 571.5950 5.5 571.5970 7.5 571.5890 12 571.5960 25 1957 571.58221 2 571.58781 7.5 571.59521 5.5 571.59721 7.5 571.58941 12 571.58951 12 571.59421 30 571.59431 30 571.59621S 30 571.50631L 30 571.59801G 30 571.59811GL 30 1958 571.5823 2 571.5953 5.5 571.5973 7.5 571.5878 7.5 571.5893 12 571.5896 12 571.5897L 12 571.5944 35 571.5945L 35 571.5982 35 571.5983L 35 571.5990 35 571.5991L 35 1959 571.5824 2 571.5954 5.5 571.5879 7.5 571.5974 7.5 571.5880 12 571.5898 12 571.5899 12 571.5944 35 571.5945L 35 571.5982 35 571.5983L 35 571.5990 35 571.5991L 35 1960 571.58241 2 574.60000 3.6 574.60070 7.5 574.60120 12 574.60290 25 574.60310 25 574.60440 40 574.60460 40 574.60620 60 1961 574.6001 3.6 574.6008 7.5 574.6013 14.1 574.6033 27.7 574.6035 27.7 574.6050 43.7 574.6070 75.2 1962 571.5833 2 574.6001 3.6 574.6005 6 574.6008 7.5 574.6013 14.1 574.6033 27.7 574.6035 27.7 574.6052 43.7 574.6072 75.2 1963 571.58250 2 574.60020 3.5 574.60060 6 574.60090 7.5 574.60140 14.1 574.60340 28 574.60360 28 574.60540 45 574.60550 45 574.60740 75 574.60750 75 ESKA sold its first outboard in 1960. Eska took a single cylinder air cooled engine made by Tecumseh and attached it to a Clinton lower unit. They continued unchanged until 1973 when Eska introduced a water cooled two cylinder 9.9 and 15 HP motor. Eska supplied motors to many retailers such as Sears, Pennys, Grants and others. Muncie Gear Works, made motors under many brands such as Muncie, Neptune, Sea Gull, Skipper, Mighty Mite and also Sea King brand for Montgomery Wards, as well as the Motorgo and Waterwitch brands for Sears Roebuck and Company.Employment grew again through the late sixties, with Muncie Gear being a major supplier of rocket parts to the Army, for the Viet Nam conflict.

Year model HP 1935 A Std Single 3.2 1936 1B Std Single 3.2 1936 2B Lite Twin 4.4 1936 3B Senior Twin 7.6 1937 S1C Std Single 2.9 1937 D1C Deluxe Single 3.2 1937 S2C Std Lite Twin 3.4 1937 D2C Deluxe Lite Twin 4.4 1937 D3C Deluxe Senior Twin 6.6 1937 R1C Red Flash Single 3.2 1938 S1D Std Single 2.9 1938 D1D Deluxe Single 3.2 1938 S2D Std Lite Twin 3.4 1938 D2D Deluxe Lite Twin 4.4 1938 D3D Deluxe Senior Twin 6.6 1939 S1E Std Single 2.9 1939 D1E Deluxe Single 3.2 1939 D2D Deluxe Lite Twin 4.4 1939 D3D Deluxe Senior Twin 6.6 1940 S1F Kingfisher Single 3.2 1940 D1F Challenger Single 3.2 1940 S2F Fish Hawk Lite Twin 3.4 1940 D2F Play Boy Lite Twin 5.5 1940 B1F Blue Streak Single 3.2 1941 S1G Kingfisher Single 3.0 1941 D1G Challenger Single 3.0 1941 S4G400 Std Single 3.6 1941 D4G400 Deluxe Single 3.6 1941 2G Viking Twin 5.3 1941 3G Electra Twin 6.1 1941 M1G Ensign Single 3.0 1941 M4G Commodore Single 3.6 1941 M2G Admiral Twin 5.3 1942 1H Super Single 3.9 1942 2H Viking Twin 5.8 1946 1J Standard Single 4.2 1946 2J Deluxe Single 4.2 1947 1J Standard Single 4.2 1947 2J Deluxe Single 4.2 1948 1K Standard Single 4.2 1948 2K Deluxe Single 4.2 1948 4K Twin 7.9 1949 1K 4.2 1949 2K 4.2 1949 4K 7.9 1949 4KS Special Racer 7.9 1950 1L 4.2 1950 2K 4.2 1950 2L-HD 4.2 1950 4K 7.9 1950 4L-HD 7.9 1950 4LS Special Racer 7.9 1951 1L 4.2 1951 2K 4.2 1951 2l-HD 4.2 1951 4K 7.9 1951 4L 8.5 1951 4L-HD 8.5 1951 4L-S Hot Rod Special 8.5 1952 1L 4.2 1952 2K 4.2 1952 2L-HD 4.2 1952 4L 8.5 1952 4L-HD 8.5 1952 4L-S 1X Hot Rod Special 8.5 1953 2M 3.5 1953 3M-GS Shift 5.0 1953 4M-GS Shift 7.5 1953 4M-HD 7.5 1953 6M-GS Shift 15 1953 6M-HD 15 1953 4M-HR Class JU Hot Rod 7.5 1953 5M-HR Class AU Hot Rod not rated 1953 6M-HR Class BU Hot Rod 15 1954 2MM 3.5 1954 3M-GS Shift 5.0 1954 4M-GS Shift 7.5 1954 4M-HD 7.5 1954 6M-GS Shift 14 1954 6M-HD 15 1954 4M-HR Class JU Hot Rod not rated 1954 4M-HR Midget not rated 1954 5M-HR Class AU Hot Rod not rated 1954 6M-HR Class BU Hot Rod not rated 1955 3MM-GS Shift 5.5 1955 4MM-GS Shift 7.5 1955 6MM-GS Shift 16.5 1955 6MS-GS Shift 16.5 1955 4MM-HR Class AU Hot Rod not rated 1955 6MM-HR Class BU Hot Rod not rated 1956 2N 4.2 1956 3N-S 6 1956 4N-D 7.8 1956 6N-D 16.5 1956 6N-MS 16.5 1956 6N-HR Class BU Hot Rod not rated 1957-8 2N 4.2 1957-8 3N-S 6 1957-8 4N-D 7.8 1957-8 6N-D 16.5 1957-8 6N-MS 16.5 1957-8 T6N-MS Tandem 33 consisted of twin 16.5's 1957-8 6N-HR Class BU Hot Rod not rated. That way your covered for lube specifics regardless of whatevers written on the engine.Especially when mixing for older engines with the modern two oils which most likely have better lube and burning qualities than old stock oils.1965 1147 3 1140, 1144 4 1142, 1145, 1148 5 1141, 1146 6 1966 1153 3 1157, 1159 6 1967 1160, 1161, 1163, 1173 3 1162, 1164, 1165 5 1166, 1169, 1175 5 1167, 1168, 1170, 1174 7 1968 1183,1193 3 1178,1180, 1185, 1195 5 1179, 1181, 1187, 1197 7 1969 1188, 1703, 1713 3.5 1700, 1703A, 1709, 1713A 3.5 1189, 1194, 1710, 1705, 1715, 1701, 1706 5 1186, 1199, 1702, 1707, 1717, 1708, 1711 7 1970 1188B, 1703B, 1704B, 1709B,1713B, 1732B 3.5 1189B, 1701B, 1733B, 1705B, 1706B, 1733B 5 1199B, 1702B, 1707B, 1708B, 1717B, 1734B 7 1971 1703B, 1713B 3.5 1705B, 1715B 5 1707B, 1717B 7 1727A, 1747A 7 1972 1703D, 1788A 3.5 1705D, 1789A 5 1747B, 1790A 7 1973 1945A 3.5 1705E 5 1928 5 1747C 7 1944 7.5 1925A 9.5 1926A 14 1974 1945B 3.5 1705F 5 1928B 5 1747D 7 1944B 7.5 1925B 9.5 1926B 14 1975 1974A 4.5 1975A 5.5 1944C 7.5 1976A 7.5 1978A 9.9 1979A 15 1976 1973B 3 1974B 4.5 1975B 5.5 1944D 7.5 1976B 7.5 1978C 9.9 1979C 15 1977 14058 1.2 14089 2.5 14034 3.5 14035 5 14036 5 14037 7.5 14038 7.5 14059 7.5 14039 9.9 14040 15 1978 14058 1.2 14110 1.5 14089 2.5 14034 3.5 14035 5 14106 5 14107 7.5 14108 7.5 14109 9.9 1979 14058 1.2 14089 2.5 14034 3.5 14035 5 14106 5 14107 7.5 14108 7.5 14109 9.9 14110 15 1980 14139 3.5 14140 5 14141 7.5 14152 9.9 14153 15 The models and model numbers remain basically unchanged until production is discontinued in 1987. The years are determined by serial numbers, which is too cumbersome to print here. A good source for parts for Eska products is Certified Parts Corp. In 1941 Gambles Department Store began selling Hiawatha outboard motors. Thanks Jeff Jeff There is a book called the "Old Outboard Book" by Peter Hunn, In it He gives ballpark values on old motors.

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