original early 1870's american victorian era white "alabama" (officially known as sylacauga) marble fireplace mantel keystone fabricated by the chicago marble mfg. co., chicago, il. the flush mount keystone features a nice profile with beveled edges and centrally located carved floral rosette. the keystone was salvaged from an italianate style chicago residence. the chicago marble manufacturing company was founded in 1845, but not incorporated until 1872. at that time orin sherman was superintendent, and one hundred and twenty-five men were employed. chicago marble supplied the mantels, grates, etc, for the gardner house, matteson house, sherman house, grand pacific and tremont, prior to 1873, as well as for many dwelling houses during this time period. their yards were located at 713—15 wabash avenue, chicago, il. measures approximately 11 x 8 inches.