Can anyone help me dating my J.C. Cockhill?

Can anyone help me dating my J.C. Cockhill?
Got it a few days ago as a real bargain, it has a very nice shape and sound like a ringing bell (although i expected no special sound because of the grind).
I guess it comes from the second half of the 19th Century but maybe someone has more infos.

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John Creswick Cockhill was born in 1826 and started business in 1855. In 1861 he was a razor manufacturer in Eldon Street and employed 21 workers. In 1862 he was a spring knife and razor maker at Beehive Works, Duke and Porter Street. The corporate mark in the 1862 directory was 'Beehive'. His later trade mark was a picture of a dragon. He had a contract with the government and made razors for the Army and Navy and various Sheffield firms. Best I can do with the date is 1855 to 1890. My opinion is, because of the hollowness of the grind, it is 1870 -1880.
Nice Razor,
Karl