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Seems to me like you have " American stone"
" The "Finest Grit" water hone is bluish-grey American stone , which requires from seventy- five to one hundred strokes. AS its name indicates, it is a very fine hone, which the manufacturer claims that is impossible to make a wire edge on razors honed up it. Length , five and six inches. Price $ 1.00 to $1.50. Sold by barber supply and the manufacturers, , National Hone and Soap Co., Leaveuenworth , Kansas."
Nice stone - congrats. You can read more at " Essay on Barbers' Razors, Razors Hones, Razors Strop and Razors Honing. WWW.Scribdassets.com
BR
JSZ