Omega Seamaster Manual Wind Waterproof Models
Type	Calibre	Size (mm)	Beat	Production	Seamaster
						De Ville	30	300	Cosmic	Chronograph	Chronometre	Chonostop
Gents Standard	283	30	18,000	1949~56	•		•
	284	30	18,000	1955~59	•
	285	30	18,000	1958~61	•
	286	30	18,000	1961~63	•		•
	371	28	18,000	1950~52	•
	600	27.9	19,800	1960~64		•			•
	601	27.9	19,800	1964~74	•	•	•	•	•
	420	26.5	18,000	1952~59	•
	520	25	19,800	1957~59	•
Gents Small Seconds	261	30	18,000	1941~49	•
	266	30	18,000	1950~56			•				•
	267	30	18,000	1956~59	•
	268	30	18,000	1958~61	•
	269	30	18,000	1961~63	•		•
Gents Calendar	610	27.9	19,800	1960~63	•	•
	611	27.9	19,800	1964~74	•	•		•	•
	613	27.9	19,800	1967~74	•				•
Ladies Standard	630	17.5	19,800	1962~79	•	•			•
	252	R13.5	21,600	1951~61	•
	482	12.5	19,800	1957~59	•
Chronograph	321	27	18,000	1946-68						•
	861	27	21,600	1968~73						•
	865	27	21,600	1966~75								•
Chronograph Calendar	920	27	21,600	1969~73								•
	930	27	21,600	1969~72						•