Not interested in sellingA very nice 7-day set but we cannot give a price of how much they are worth, but they are worth as much as your willing to pay.
The only info i could find without digging deep is SAMUEL OSBORN & CO Sheffield circa 1878 - at least 1919 that's if its the same maker.
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7. B&B is not an appraisal site. All B&B members, asking and answering, new or old, should be aware that B&B is a community of users. We appreciate the collection of wetshaving gear for it's form and function, and valuation of said gear is acceptable provided your sole intent is not resale. Any member which uses B&B as their value and/or identification service with intent to profit will have their membership removed. Any thread that asks for value or identification may be deleted at the sole discretion of the moderator team.
Not interested in selling
You get a better steady angle and a sharper edge without a lot of wear on the spine if any.
Their "finest" grit stone is what is generally considered to be the coarsest stone one would use on a razor.