I own an instruction book for new home sewing machine model 445
inside this book is a lifetime guarantee and on this guarantee is the date of purchase 02-21-1968. With dealers name and singed by purchaser
new home sewing machine model 170
1987
The first sewing machine was patented by Elias Howe 9/10 1846. Isaac Singer patented the first model for home use 1854 (announced in 1851).
Directly from Westinghouse would your best first bet...
No it's not. I just purchased one and it will not see a patch on a thin leather vest. The machine is a good machine but if your looking for an industrial machine this is not the one for you. I thought it was when I bought it, but for 30 bucks I still have a great machine for my lite work!
ebay
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You use a sewing machine
Ebay
The only way to determine the value of any sewing machine is to have an expert examine it. The value depends on the condition of the machine and how rare it is.
I'm not aware of a 'new' machine with the model 52F. What is the manufacturer if you're looking. I do know of a Free Westinghouse 52F. Worth 0% except to someone who wants parts.
If you mean models of sewing machine, probably hundreds. Singer started in 1851 and made many industrial models as well as home sewing machines.