Howdy. The attached photo is an iron doorknob from the 1880s or 1890s that has the Frisco logo. I'm guessing it was used in a prominent depot somewhere along the line, as the cost to make these custom knobs required a quantity be ordered. The seller was from St. Louis but did not know the origin. Might any of y'all have info about where this knob was used? There is a different iron knob that was used in the Frisco office building in St. Louis, which did not use the logo. Thanks.