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Dating Singers and the wife will not be mad at you.

Pre War Singers

9 R 1939 J26301R-26800R 500
  1940 J27601R-27962R 362

Post War Singers

The letters following the chassis number as well as some of the unit numbers (eg the engine, gear box, rear axle, etc) indicate the year of manufacture on post war Singers.

The serial number is just behind the right front suspension, I am working on a drawing for ALL Singer's to show the location of all the number.

9 R 1939 J26301R-26800R 500
  1940 J27601R-27962R 362
9A 1946/7 A101Q-533Q 433
  1948 A534R-1578R 1045
  1949 A1579S-2600S 1022
9 4A 1950 4A2601T-2675T 57
  1951 4A2658U-5972U 3315
9 4AB 1951 4AB7001U-7714U 714
  1952 4AB7715V-8001V 287
4 AC 1951/2 4AC1U-13V 13
4 AD 1951 4AD1U-417U 417
  1952 4AD418V-1963V 1546
  1953 4AD1964W-2869W 906
  1954 4AD2870X-3344X 475
  1955 4AD3345Y-3493Y 95
  1956 4AD3440Z 1
4 ADT 1953   270
  1954   355
  1955   75
SMX E1X-E12X   12

Total production = 11,950, Left Hand Drive cars have a 'L' prefix so the number would be L4AD. Twin carburated cars have a 'T' in the number as in 4ADT.

Take for example an SM 1500 roadster with chassis number 4AD3024 X, engine number 3046 W, gearbox number 3090 X and rear axle number 2957 X.

The car is a 1954 ("X" chassis number), but the engine is a 1953 ("W"). The gear box and rear axle are both 1954 ("X").