Ludlow Serial #'s

YEAR	SERIAL NUMBERS SHIPPED	YEAR	SERIAL NUMBERS SHIPPED

1919	Original Hole style MP (247)	1947	5000-5300
1919	300-400	1948	5400-5900
1920	500-700	1949	6000-6400
1921	800	1950	6500-7000
1922	900	1952	7100-7500
1923	1000-1100	1953	8100-8500
1924	1200-1300	1954	8600-9100
1925	1400-1600	1955	9200-9600
1926	1700-1800	1956	9700-10200
1927	1900-2100	1956	Sep – New style panel box with 2-wire thermostat introduced
1928	2200-2400	1957	10300-10700
1929	2500-2700	1958	10800-11100
1930	2800-2900	1959	11200-11600
1931	3000-3100	1960	11700-12200
1932	Feb – First slotted MP (A247A) ~ 1 1/4" X 2 1/2" funnel	1961	12300-12600
1932	May – MP funnel changed to 1 1/4" X 2 3/4" long (A247B)	1961	MP funnel changed to 3/8"F & 3/4"R (A247CD)
1932	3200	1962	12700-12900
1933	3300	1963	13000-13200
1934	3400-3500	1964	13400
1936	3600-3700	1964	Apr MP funnel changed to 5/8" F&R with 3-holes (A247F)
1937	3800	1965	Model M Introduced
1938	May – MP funnel depth changed to 3/4" X 3/8" rear (A247C) Shallower version introduced later same month (A247D)	1965	16000-16300
1938	3900-4000	1966	16400-16800
1939	4100-4200	1966	Aug – Rear table latch & LF table latch discontinued also Little Giant water pump discontinued & replaced with Heat Exchanger brand
1940	4300	1967	16900-17300
1941	4400	1968	17400-17600
1942	4600	1968	Nov = New style cutler Hammer relays (9575-H-2683)
1943	4700	1969*	* Converted crucible to solid lock-up – crucible spring eliminated & .030 undersized main cam roll introduced as well as removable well
1944	4800	1969	18000-18200
1945	NO MACHINES SHIPPED	1970	18300-18400
1946	4900	1971	18500

* This proved to be ineffective and damaging. All Model "M" machines that have this arrangement should be converted to prevent excessive wear and damage.