Model	Year	Serial Numbers
180	1953 thru 1956	30000 thru 32661
180		604, 614
180A	1957	32662 thru 32999
180A	1957 thru 1958	50001 thru 50355
180B	1959	50356 thru 50661
180C	1960	50662 thru 50911
180C		624
180D	1961	18050912 thru 18051063
180E	1962	18051064 thru 18051183
180F	1963	18051184 thru 18051312
180G	1964	18051313 thru 18051445
180H	1965 thru 1972	18051446 thru 18052284
180H		645
180J	1973 thru 1976	18052285 thru 18052489
180J	1973 thru 1976	18052491 thru 18052770
180K	1977	18052771 thru 18052905
180K	1978	18052906 thru 18053000
180K	1979	18053001 thru 18053115
180K		18052490
180K	1980	18053116 thru 18053167
180K	1981	18053168 thru 18053203