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The mechanic's workshop handybook - by Paul N. Hasluck, 1854-1931

"A Cheap and Excellent stone for general purpose is called Nova Scotia Oilstone, and nearly resembles
the Washita or Ouachita...

United States Commission - International Exhibition, 1876
"Nova Scotia - Blue or yellowish-gray color, and of all grits, from the finest to the hardest from the coarsest to the softest; the largest...

Do we talk about Candian Oilstone / Magog Oilstone ?
Actually i never heard of the term "Nova Scotia" Hone. I do unterstand that we talk about a canadian Stone.

The Term Nova Scotia founds the...

Here is an Genuine Crecian Hone (Idwal Stone) i own with the label:

https://c2.staticflickr.com/8/7699/27878480280_d48b7e0893_c_d.jpg
...

Check here my friend:

James Howarth + Sons, Sheffield
http://www.popularwoodworking.com/woodworking-blogs/editors-blog/james-howarth-19th-century-toolmaker
...