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Tos Razor Blade Hone:

https://farm6.staticflickr.com/5558/15032688807_57ce738abe_c_d.jpg

https://farm4.staticflickr.com/3904/15219223805_07148f386e_c_d.jpg
...

another ToS Stone, this one has a really nice pattern and layering:

https://farm4.staticflickr.com/3838/14726940835_94dc7f9811_c_d.jpg...

ToS 18 x 4,5 x 2
https://farm8.staticflickr.com/7347/13483899714_af20119775_b_d.jpg

https://farm4.staticflickr.com/3702/13483529865_ec2dc66756_b_d.jpg

Some pictures of ToS Stones:

http://farm4.staticflickr.com/3829/12778642945_8e94087a95_b_d.jpg

http://farm4.staticflickr.com/3804/12778981643_b9ccc8f374_b_d.jpg
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somethin more here:

Dalmore, Water Of Ayr And Tam O'shanter Hone Works, Stone Mine | ScotlandsPlaces
Panoramio - Photo of A petter hot-bulb engine in Laigh Dalmore quarry

If anybody is interested in some more history of the "Water of Ayr and Tam o Shanter Hone Works"....

you should visit the following site with really great Information about the "Works" in...