There were a small handful of manufacturers who made "generic" machines in the mid 20th Century (like the Morse pictured above).
Many of them were based on a Singer class 15 machine, and are commonly known as "Singer Clones" - read a bit more about them here. If your sewing machine looks a lot like these machines but has an off brand name, chances are you have a generic or clone machine.
The most likely answer is that the larger number was the total number of machines produced by Singers when they only had a few factories and could keep up with and control the production output from Britain and America.
A - Podolsk, Russia A - Anderson, South Carolina, USA B - Elizabeth, New Jersey USA B - Bridgeport, Connecticut, USA C - Wittenberge, (Prussia) Germany D - Elizabeth, New Jersey USA E - Podolsk, Russia E - Elizabethport, New Jersey, F - Clydebank, Scotland G - Elizabeth, New Jersey USA G - Industrial Germany 1910 F-1 to F-1.079.124 1911 F-1.079.125 to F-1.987.314 1912 F-1.987.315 to F-3.316.719 1913 F-3.316.720 to F-4.621.564 1914 F-4.621.565 to F-5.915.524 1915 F-5.915.525 to F-6.646.349 1916 F-6.646.350 to F-7.314.979 1917 F-7.314.980 to F-8.147.769 1918 F-8.147.770 to F-8.721.799 1919 F-8.721.800 to F-9.317.989 1920 F-9.317.990 to F-9.999.999 1920 Y-1 to Y-160.700 1921 Y-160.701 to Y-354.390 1922 Y-354.391 to Y-768.330 1923Y-768.331 to Y-1.628.300 1924 Y-1.628.301 to Y-2.344.170 1925 Y-2.344.171 to Y-3.775.310 1926 Y-3.775.311 to Y-4.387.390 1927 Y-4.387.391 to Y-5.658.823 1928 Y-5.658.824 to Y-6.307.594 1929 Y-6.307.595 to Y-7.450.266 1930 Y-7.450.267 to Y-8.375.207 1931 Y-8.375.208 to Y-8.449.942 1932 Y-8.449.943 to Y-8.633.634 1933 Y-8.633.635 to Y-9.162.104 1934 Y-9.162.105 to Y-9.633.846 1935 Y-9.633.847 to Y-9.999.999EA-000.001 to EA-203.878 EA-203.879 to EA-869.974 EA-869.975 to EA-999.999 EB-000.001 to EB-705.753 EB-705.754 to EB-956.428 EB-956.429 to EB-999.999 EC-000.001 to EC-589.135 EC-589.136 to EC-999.999 ED-000.001 to ED-202.377 ED-202.378 to ED-232.773 ED-232.774 to ED-242.053 ED-242.054 to ED-311.246 ED-311.247 to ED-745.856 ED-745.857 to ED-942.976 ED-942.977 to ED-999.999 EE-000.001 to EE-453.220 EE-453.221 to EE-933.528 EE-933.529 to EE-999.999 EF-000.001 to EF-600.940 EF-600.941 to EF-999.999 EG-000.001 to EG-312.860 EG-312.861 to EG-999.999 EH-000.001 to EH-012.026 EH-012.027 to EH-787.882 EH-787.883 to EH-999.999 EJ-000.001 to EJ-449.138 EJ-449.139 to EJ-999.999 EK-000.001 to EK-123.026 EK-123.027 to EK-992.399 EK-992.400 to EK-999.999 EL-000.001 to EL-999.999 EM-000.001 to EM-015.256 EM-015.257 to EM-999.999 EN-000.001 to EN-970.333 EN-970.334 to EN-999.999 EP-000.001 to EP-771.032 EP-771.033 to EP-999.999 ER-000.001 to ER-999.999 ES-000.001 to ES-238.743 ES-238.744 to ES-999.999 ET-000.001 to ET-179.954 ET-179.955 to ET-999.999 EV-000.001 to EV-019.712 EV-019.713 to EV-602.138 EV-602.139 to EV-999.999 EW-000.001 to EW-005.230 EW-005.231 to EW-020.180 EW-020.181 to EW-024.830 EW-024.831 to EW-030.680 EW-030.681 to EW-038.630 EW-038.631 to EW-045.210 EW-045.211 to EW-054.3101935 1936 1937 1937 1938 1939 1939 1940 1941 1942 1943 1944 1945 1946 1947 1947 1948 1949 1949 1950 1950 1951 1951 1952 1953 1953 1954 1954 1955 1956 1956 1956 1957 1958 1959 1959 1960 1960 1960 1961 1961 1962 1962 1963 1964 1960 1961 1962 1963 1964 1965 1966Most of us know the name Singer but few are aware of his amazing life story, his rags to riches journey from a little runaway to one of the richest men of his age.
For the first time the most complete story of a forgotten giant is brought to you by Alex Askaroff.
Poor = A machine that has been used hard or has weathered badly.
Extensive damage to the finish like rubbed off decals, scratches from use, dings in the finish, possibly some surface rust.
Thanks to your website, I have been able to date my $2 Trash and Treasure Singer as a 1939 model, manufactured in Scotland.