As KB stated: Knowles, Taylor, Knowles.....started in East Liverpool Ohio, 1853 or 54 as Knowles. In 1870 John Taylor and Knowles son joined and it became Knowles, Taylor, Knowles. I can't find my book on KTK. Looks like I'll need to get a new one. Not sure about S--V. Might stand for Semi-Vitreous. The SFJ is perhaps the decorators initials. Like many other pottery factories KTK furnished blanks for serious and amateur china painters. When the initials are present it usually means that it was fired at the factory. Retail no chips cracks etc.....$100
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best..........Tim
I'll stand corrected and apoligize if I'm not correct about the lettering.