The identification of vintage Singer sewing machines

Or how to tell t'other from which, as they used to say in Lancashire.  They might still do, actually, but I digress If you're on the phone to somebody who's put a for sale ad in the local rag which just says "Old Singer sewing machine for sale" or something equally informative, you obviously…

A lovely Singer sewing machine written with Model 15NL and a serial number NLT5057578. According to it's previous owner, this piece of machine is

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