My Singer 477 Instruction Manual has a date of 1968 on it...that may help.
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The singer sewing machine with a serial number AD588457 was 1933, model 15. Made in Elizabeth, NJ.
This model was made in 1972-73
Model 237, made in Monza, Italy. 1968-1972
I have this sewing machine and after doing some research on the internet I found out it was made in 1938, in Elizabeth, N.J. 10,000 were distributed. I found a singer web site that can help you rate your machine. Hopefully this is helpful.
It was manufactured in 1957 in Great Britain.