I sold several of these 20" "SIMONDS SAW WORKS"  blades a while back here on ebay. When I first listed one, I received a very informative email from a gentleman who's relative (grandfather?) who represented Simonds tools  many years ago....... He noted the "The SIMONDS SAW WORKS" name had stopped being used in 1918,  there after it was called the Simonds Saw Company (or something similar) the point being the "Works" was no longer in the title after 1918. Also I believe Simonds moved to a different manufacturing location/city at that time. So, I'm told this saw blade is from around 1918 or earlier

As you can see one side of this blade as show in our first 4 pictures has some scratches from being stored "stacked" with those other blades, while the opposite side has some pitting and dulling from rust damage so look at our pictures closely

Six of these blades came to me in 1979 with a large cut off saw that worked exactly like the Bosch GCM12SD sliding miter saw...only mine was very old and weighed about 2000 pounds. I called it a broken arm saw because it had one vertical and one horizontal arm that hinged open and closed together in unison to locate the saw motor and it's blade....with zero friction...........At 3600RPMs it screamed so I bought a 16"  carbide blade for it and it still screamed     

Flat rate shipping to 48 states in USA only......everyone else contact before you bid for shipping cost

 Some people make these into shop clocks.........