>
> GG

I undoubtedly have this wrong, but I think that Disston invented the  
saw nut as we know it now in 1875, so any Disston with split nuts is   
older than that, but from other makers could be younger too.  Imagine  
the confusion a hundred years from now when 22nd century gilutes come  
across a "modern" split nut saw.
>
> I don't know much about Spear and Jackson, so I was doing some
> Googling and found a reference that S&J stopped using split nuts
> between 1850-1860.

Ed Minch

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